General
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Target
PO2100135.doc
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Size
129KB
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Sample
210120-1f7grmbb22
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MD5
abb6916bdf5c4028fa49c614c200f180
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SHA1
79017f043d266043ce042fa654c89b8af9c163f4
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SHA256
6810cc6edb1ced93f416b478d0d793b3a01bcfd37d8927388fd55ec2b1086e29
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SHA512
52b89f3d1a578fbe04d567b06d049f1ddb3cde5f0f9305bc47998df2a1790ddb63d12ec32ddc4657a381a55144929b03c96c519726ae1ade2a93a272b9eb1fe6
Static task
static1
Behavioral task
behavioral1
Sample
PO2100135.doc
Resource
win7v20201028
Behavioral task
behavioral2
Sample
PO2100135.doc
Resource
win10v20201028
Malware Config
Extracted
agenttesla
Protocol: smtp- Host:
mail.privateemail.com - Port:
587 - Username:
admin@adipico.com - Password:
HELPMELORD@2021
Targets
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Target
PO2100135.doc
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Size
129KB
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MD5
abb6916bdf5c4028fa49c614c200f180
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SHA1
79017f043d266043ce042fa654c89b8af9c163f4
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SHA256
6810cc6edb1ced93f416b478d0d793b3a01bcfd37d8927388fd55ec2b1086e29
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SHA512
52b89f3d1a578fbe04d567b06d049f1ddb3cde5f0f9305bc47998df2a1790ddb63d12ec32ddc4657a381a55144929b03c96c519726ae1ade2a93a272b9eb1fe6
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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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AgentTesla Payload
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Looks for VirtualBox Guest Additions in registry
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Blocklisted process makes network request
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Executes dropped EXE
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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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Loads dropped DLL
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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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Drops file in System32 directory
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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
3Virtualization/Sandbox Evasion
2