General
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Target
effp.exe
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Size
15KB
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Sample
210120-kcmkvc455a
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MD5
1983ead6d04607d63ca056ec796fb87f
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SHA1
a437a10a281b78b7e7d87049a7864ed9fb2dc765
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SHA256
74e35db0e018a83a1002237e7521e2cc0f2d03c6befa319d2b55c68f248f5bbd
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SHA512
f4c195487428ed46830bf5047c87614d575adb871e8e8e32bb9eb9806be07b8076a78903288b5d7323e5930f5a4b7ef914bd25b0c5d7dc59dad7c445441e6c8b
Static task
static1
Behavioral task
behavioral1
Sample
effp.exe
Resource
win7v20201028
Behavioral task
behavioral2
Sample
effp.exe
Resource
win10v20201028
Malware Config
Extracted
agenttesla
Protocol: smtp- Host:
mail.privateemail.com - Port:
587 - Username:
nancy.chen@exxacitcorp.com - Password:
LifeDram2021
Targets
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Target
effp.exe
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Size
15KB
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MD5
1983ead6d04607d63ca056ec796fb87f
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SHA1
a437a10a281b78b7e7d87049a7864ed9fb2dc765
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SHA256
74e35db0e018a83a1002237e7521e2cc0f2d03c6befa319d2b55c68f248f5bbd
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SHA512
f4c195487428ed46830bf5047c87614d575adb871e8e8e32bb9eb9806be07b8076a78903288b5d7323e5930f5a4b7ef914bd25b0c5d7dc59dad7c445441e6c8b
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AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
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Modifies WinLogon for persistence
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Turns off Windows Defender SpyNet reporting
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AgentTesla Payload
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Looks for VirtualBox Guest Additions in registry
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Looks for VMWare Tools registry key
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Checks BIOS information in registry
BIOS information is often read in order to detect sandboxing environments.
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Drops startup file
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Reads data files stored by FTP clients
Tries to access configuration files associated with programs like FileZilla.
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Reads user/profile data of local email clients
Email clients store some user data on disk where infostealers will often target it.
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Reads user/profile data of web browsers
Infostealers often target stored browser data, which can include saved credentials etc.
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Adds Run key to start application
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Legitimate hosting services abused for malware hosting/C2
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Maps connected drives based on registry
Disk information is often read in order to detect sandboxing environments.
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Suspicious use of NtSetInformationThreadHideFromDebugger
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Suspicious use of SetThreadContext
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MITRE ATT&CK Matrix ATT&CK v6
Persistence
Winlogon Helper DLL
1Modify Existing Service
1Registry Run Keys / Startup Folder
1Defense Evasion
Modify Registry
6Disabling Security Tools
4Virtualization/Sandbox Evasion
2