General
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Target
26f5f239c823689bf255c4ecf37f085a6540c9fe9951fb4bca4484f1caadcbd7
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Size
650KB
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Sample
220521-bxap1affep
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MD5
7af3b665e41dea7ce96c3e89ca995853
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SHA1
e2a5c1cec80b5b92b62e60e6bf32292917a8c931
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SHA256
26f5f239c823689bf255c4ecf37f085a6540c9fe9951fb4bca4484f1caadcbd7
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SHA512
b3ce5dfaa84b11e407f8103870ce61de8e367dc58606733f791dd143065747f2d57e8305efb0cb7243a181402bed845a24106c167a5d8c3f0ddff091014fbead
Malware Config
Extracted
agenttesla
Protocol: smtp- Host:
mail.karmachalets.co.in - Port:
587 - Username:
[email protected] - Password:
Akshya@123
Extracted
Protocol: smtp- Host:
mail.karmachalets.co.in - Port:
587 - Username:
[email protected] - Password:
Akshya@123
Targets
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Target
Arrival551132_XGG1635006pdf.exe
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Size
722KB
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MD5
0f9420abd956257bc58cd6dda5097b66
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SHA1
488a0500f179f9dc3d4a6f81a03e4c1355fc036e
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SHA256
9003935bc497446d14818f11d156c3cd52a891c394ed13d544e30c6dafff1e2a
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SHA512
7f912af19c1da438e13188c9710519d5814798531b857086d71edae9451dc5760cc3e71fc4d06b9c3811894f8ca21d8fba917e6a800cdf31214613b73fa9c972
Score10/10-
AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
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CoreEntity .NET Packer
A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.
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AgentTesla Payload
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Looks for VirtualBox Guest Additions in registry
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ReZer0 packer
Detects ReZer0, a packer with multiple versions used in various campaigns.
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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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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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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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Accesses Microsoft Outlook profiles
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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 SetThreadContext
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