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T1203 Exploitation for Client Execution

Adversaries may exploit software vulnerabilities in client applications to execute code. Vulnerabilities can exist in software due to unsecure coding practices that can lead to unanticipated behavior. Adversaries can take advantage of certain vulnerabilities through targeted exploitation for the purpose of arbitrary code execution. Oftentimes the most valuable exploits to an offensive toolkit are those that can be used to obtain code execution on a remote system because they can be used to gain access to that system. Users will expect to see files related to the applications they commonly used to do work, so they are a useful target for exploit research and development because of their high utility.

Several types exist:

Browser-based Exploitation

Web browsers are a common target through Drive-by Compromise and Spearphishing Link. Endpoint systems may be compromised through normal web browsing or from certain users being targeted by links in spearphishing emails to adversary controlled sites used to exploit the web browser. These often do not require an action by the user for the exploit to be executed.

Office Applications

Common office and productivity applications such as Microsoft Office are also targeted through Phishing. Malicious files will be transmitted directly as attachments or through links to download them. These require the user to open the document or file for the exploit to run.

Common Third-party Applications

Other applications that are commonly seen or are part of the software deployed in a target network may also be used for exploitation. Applications such as Adobe Reader and Flash, which are common in enterprise environments, have been routinely targeted by adversaries attempting to gain access to systems. Depending on the software and nature of the vulnerability, some may be exploited in the browser or require the user to open a file. For instance, some Flash exploits have been delivered as objects within Microsoft Office documents.

Item Value
ID T1203
Tactics TA0002
Platforms Linux, Windows, macOS
Version 1.4
Created 18 April 2018
Last Modified 18 April 2022

Procedure Examples

ID Name Description
G0018 admin@338 admin@338 has exploited client software vulnerabilities for execution, such as Microsoft Word CVE-2012-0158.44
S0331 Agent Tesla Agent Tesla has exploited Office vulnerabilities such as CVE-2017-11882 and CVE-2017-8570 for execution during delivery.5
G0138 Andariel Andariel has exploited numerous ActiveX vulnerabilities, including zero-days.495051
G1007 Aoqin Dragon Aoqin Dragon has exploited CVE-2012-0158 and CVE-2010-3333 for execution against targeted systems.88
G0005 APT12 APT12 has exploited multiple vulnerabilities for execution, including Microsoft Office vulnerabilities (CVE-2009-3129, CVE-2012-0158) and vulnerabilities in Adobe Reader and Flash (CVE-2009-4324, CVE-2009-0927, CVE-2011-0609, CVE-2011-0611).6768
G0007 APT28 APT28 has exploited Microsoft Office vulnerability CVE-2017-0262 for execution.90
G0016 APT29 APT29 has used multiple software exploits for common client software, like Microsoft Word, Exchange, and Adobe Reader, to gain code execution.282930
G0022 APT3 APT3 has exploited the Adobe Flash Player vulnerability CVE-2015-3113 and Internet Explorer vulnerability CVE-2014-1776.8586
G0050 APT32 APT32 has used RTF document that includes an exploit to execute malicious code. (CVE-2017-11882)92
G0064 APT33 APT33 has attempted to exploit a known vulnerability in WinRAR (CVE-2018-20250), and attempted to gain remote code execution via a security bypass vulnerability (CVE-2017-11774).7576
G0067 APT37 APT37 has used exploits for Flash Player (CVE-2016-4117, CVE-2018-4878), Word (CVE-2017-0199), Internet Explorer (CVE-2020-1380 and CVE-2020-26411), and Microsoft Edge (CVE-2021-26411) for execution.45464748
G0096 APT41 APT41 leveraged the follow exploits in their operations: CVE-2012-0158, CVE-2015-1641, CVE-2017-0199, CVE-2017-11882, and CVE-2019-3396.62
G0001 Axiom Axiom has used exploits for multiple vulnerabilities including CVE-2014-0322, CVE-2012-4792, CVE-2012-1889, and CVE-2013-3893.24
S0239 Bankshot Bankshot leverages a known zero-day vulnerability in Adobe Flash to execute the implant into the victims’ machines.16
G1002 BITTER BITTER has exploited Microsoft Office vulnerabilities CVE-2012-0158, CVE-2017-11882, CVE-2018-0798, and CVE-2018-0802.2625
G0098 BlackTech BlackTech has exploited multiple vulnerabilities for execution, including Microsoft Office vulnerabilities CVE-2012-0158, CVE-2014-6352, CVE-2017-0199, and Adobe Flash CVE-2015-5119.89
G0060 BRONZE BUTLER BRONZE BUTLER has exploited Microsoft Office vulnerabilities CVE-2014-4114, CVE-2018-0802, and CVE-2018-0798 for execution.9394
G0080 Cobalt Group Cobalt Group had exploited multiple vulnerabilities for execution, including Microsoft’s Equation Editor (CVE-2017-11882), an Internet Explorer vulnerability (CVE-2018-8174), CVE-2017-8570, CVE-2017-0199, and CVE-2017-8759.8483828179807778
S0154 Cobalt Strike Cobalt Strike can exploit Oracle Java vulnerabilities for execution, including CVE-2011-3544, CVE-2013-2465, CVE-2012-4681, and CVE-2013-2460.1920
G0142 Confucius Confucius has exploited Microsoft Office vulnerabilities, including CVE-2015-1641, CVE-2017-11882, and CVE-2018-0802.5655
G0012 Darkhotel Darkhotel has exploited Adobe Flash vulnerability CVE-2015-8651 for execution.87
S0243 DealersChoice DealersChoice leverages vulnerable versions of Flash to perform execution.10
G0035 Dragonfly Dragonfly has exploited CVE-2011-0611 in Adobe Flash Player to gain execution on a targeted system.21
G0066 Elderwood Elderwood has used exploitation of endpoint software, including Microsoft Internet Explorer Adobe Flash vulnerabilities, to gain execution. They have also used zero-day exploits.53
G1003 Ember Bear Ember Bear has exploited Microsoft Office vulnerability CVE-2017-11882.52
S0396 EvilBunny EvilBunny has exploited CVE-2011-4369, a vulnerability in the PRC component in Adobe Reader.11
G1011 EXOTIC LILY EXOTIC LILY has used malicious documents containing exploits for CVE-2021-40444 affecting Microsoft MSHTML.61
C0001 Frankenstein During Frankenstein, the threat actors exploited CVE-2017-11882 to execute code on the victim’s machine.97
S0391 HAWKBALL HAWKBALL has exploited Microsoft Office vulnerabilities CVE-2017-11882 and CVE-2018-0802 to deliver the payload.6
G0126 Higaisa Higaisa has exploited CVE-2018-0798 for execution.42
G0100 Inception Inception has exploited CVE-2012-0158, CVE-2014-1761, CVE-2017-11882 and CVE-2018-0802 for execution.63646566
S0260 InvisiMole InvisiMole has installed legitimate but vulnerable Total Video Player software and wdigest.dll library drivers on compromised hosts to exploit stack overflow and input validation vulnerabilities for code execution.7
G0032 Lazarus Group Lazarus Group has exploited Adobe Flash vulnerability CVE-2018-4878 for execution.16
G0065 Leviathan Leviathan has exploited multiple Microsoft Office and .NET vulnerabilities for execution, including CVE-2017-0199, CVE-2017-8759, and CVE-2017-11882.31323334
G0069 MuddyWater MuddyWater has exploited the Office vulnerability CVE-2017-0199 for execution.43
G0129 Mustang Panda Mustang Panda has exploited CVE-2017-0199 in Microsoft Word to execute code.27
C0016 Operation Dust Storm During Operation Dust Storm, the threat actors exploited Adobe Flash vulnerability CVE-2011-0611, Microsoft Windows Help vulnerability CVE-2010-1885, and several Internet Explorer vulnerabilities, including CVE-2011-1255, CVE-2012-1889, and CVE-2014-0322.96
G0040 Patchwork Patchwork uses malicious documents to deliver remote execution exploits as part of. The group has previously exploited CVE-2017-8570, CVE-2012-1856, CVE-2014-4114, CVE-2017-0199, CVE-2017-11882, and CVE-2015-1641.35363738394041
S0458 Ramsay Ramsay has been embedded in documents exploiting CVE-2017-0199, CVE-2017-11882, and CVE-2017-8570.1718
G0034 Sandworm Team Sandworm Team has exploited vulnerabilities in Microsoft PowerPoint via OLE objects (CVE-2014-4114) and Microsoft Word via crafted TIFF images (CVE-2013-3906).697071
G0121 Sidewinder Sidewinder has exploited vulnerabilities to gain execution including CVE-2017-11882 and CVE-2020-0674.7374
S0374 SpeakUp SpeakUp attempts to exploit the following vulnerabilities in order to execute its malicious script: CVE-2012-0874, CVE-2010-1871, CVE-2017-10271, CVE-2018-2894, CVE-2016-3088, JBoss AS 3/4/5/6, and the Hadoop YARN ResourceManager. 15
S0578 SUPERNOVA SUPERNOVA was installed via exploitation of a SolarWinds Orion API authentication bypass vulnerability (CVE-2020-10148).89
G0062 TA459 TA459 has exploited Microsoft Word vulnerability CVE-2017-0199 for execution.95
G0089 The White Company The White Company has taken advantage of a known vulnerability in Microsoft Word (CVE 2012-0158) to execute code.91
G0027 Threat Group-3390 Threat Group-3390 has exploited CVE-2018-0798 in Equation Editor.72
G0131 Tonto Team Tonto Team has exploited Microsoft vulnerabilities, including CVE-2018-0798, CVE-2018-8174, CVE-2018-0802, CVE-2017-11882, CVE-2019-9489 CVE-2020-8468, and CVE-2018-0798 to enable execution of their delivered malicious payloads.60575859
G0134 Transparent Tribe Transparent Tribe has crafted malicious files to exploit CVE-2012-0158 and CVE-2010-3333 for execution.54
G0081 Tropic Trooper Tropic Trooper has executed commands through Microsoft security vulnerabilities, including CVE-2017-11882, CVE-2018-0802, and CVE-2012-0158.2223
S1065 Woody RAT Woody RAT has relied on CVE-2022-30190 (Follina) for execution during delivery.14
S0341 Xbash Xbash can attempt to exploit known vulnerabilities in Hadoop, Redis, or ActiveMQ when it finds those services running in order to conduct further execution.1213


ID Mitigation Description
M1048 Application Isolation and Sandboxing Browser sandboxes can be used to mitigate some of the impact of exploitation, but sandbox escapes may still exist. 1 2
M1050 Exploit Protection Security applications that look for behavior used during exploitation such as Windows Defender Exploit Guard (WDEG) and the Enhanced Mitigation Experience Toolkit (EMET) can be used to mitigate some exploitation behavior. 3 Control flow integrity checking is another way to potentially identify and stop a software exploit from occurring. 4 Many of these protections depend on the architecture and target application binary for compatibility.


ID Data Source Data Component
DS0015 Application Log Application Log Content
DS0009 Process Process Creation


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