General
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Target
iym.exe
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Size
20KB
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Sample
210120-1lh94vqjjs
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MD5
9d1c8d505aed4eb37bd5530a0b5b3b10
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SHA1
8727180dafb631c287957dedbcc4f989fb0a5825
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SHA256
1730e8fd738a26adbe3f0b31192adf6d4cc175f021b2d06e6278e36a43efef40
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SHA512
0a1776064a7a82a53881036ed2b3ab9a30f0c842c826543202cbf6399cb10f6ca2544e95672e87ab59c84d5778544aa89dfaa802ab843aa57bf6bcbeb4f27bea
Static task
static1
Behavioral task
behavioral1
Sample
iym.exe
Resource
win7v20201028
Behavioral task
behavioral2
Sample
iym.exe
Resource
win10v20201028
Malware Config
Extracted
agenttesla
Protocol: smtp- Host:
mail.privateemail.com - Port:
587 - Username:
edubrazil4040@longjohn.icu - Password:
GODBLESS2021@
Targets
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Target
iym.exe
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Size
20KB
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MD5
9d1c8d505aed4eb37bd5530a0b5b3b10
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SHA1
8727180dafb631c287957dedbcc4f989fb0a5825
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SHA256
1730e8fd738a26adbe3f0b31192adf6d4cc175f021b2d06e6278e36a43efef40
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SHA512
0a1776064a7a82a53881036ed2b3ab9a30f0c842c826543202cbf6399cb10f6ca2544e95672e87ab59c84d5778544aa89dfaa802ab843aa57bf6bcbeb4f27bea
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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