General
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Target
PALLS.exe
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Size
16KB
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Sample
210120-sssxpn7h66
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MD5
f27fb91f116c7506a124cefb4d0cd0cc
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SHA1
ee7b6fc2072b885e349a02c135e5bea156153d42
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SHA256
8948b3f93b1fe502e9b838271ac7e46f15e5a79ea0706a7834cedcbd0c10b7d9
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SHA512
c2f3ce25fbd645db4b5945326f68b29b0d876aeca2edf95723de606de1e8e3dd0d0d5281fff3bb9d2763fc80c70daf1b6b13c4a87381afbf49d48ae7a1f33dc8
Static task
static1
Behavioral task
behavioral1
Sample
PALLS.exe
Resource
win7v20201028
Behavioral task
behavioral2
Sample
PALLS.exe
Resource
win10v20201028
Malware Config
Extracted
agenttesla
Protocol: smtp- Host:
mail.privateemail.com - Port:
587 - Username:
mrst@mrst-kr.icu - Password:
@Mexico1.,
Targets
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Target
PALLS.exe
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Size
16KB
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MD5
f27fb91f116c7506a124cefb4d0cd0cc
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SHA1
ee7b6fc2072b885e349a02c135e5bea156153d42
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SHA256
8948b3f93b1fe502e9b838271ac7e46f15e5a79ea0706a7834cedcbd0c10b7d9
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SHA512
c2f3ce25fbd645db4b5945326f68b29b0d876aeca2edf95723de606de1e8e3dd0d0d5281fff3bb9d2763fc80c70daf1b6b13c4a87381afbf49d48ae7a1f33dc8
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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