Analysis
- max time kernel
150s - max time network
152s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
13/03/2024, 00:41
General
- Target $TEMP/syncUpd.exe
- Size 200KB
- Sample240313-a17cpshe84
- SHA256 13cd1152a19fdac6581cac2bd822f34bd3026ea1783ff231e299b6d28c046a6a
Malware Config
Extracted
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stealc
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http://185.172.128.145
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url_path
/3cd2b41cbde8fc9c.php
Signatures
- Stealc
Stealc is an infostealer written in C++.
- Downloads MZ/PE file
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 IoCs
- Loads dropped DLL 2 IoCs
- Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Adds Run key to start application 2 TTPs 1 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Runs ping.exe 1 TTPs 1 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 12 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\$TEMP\syncUpd.exe"C:\Users\Admin\AppData\Local\Temp\$TEMP\syncUpd.exe"1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\JKECGDBFCB.exe"2⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\JKECGDBFCB.exe"C:\Users\Admin\AppData\Local\Temp\JKECGDBFCB.exe"3⤵
- Checks computer location settings
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /C ping 2.2.2.2 -n 1 -w 3000 > Nul & Del C:\Users\Admin\AppData\Local\Temp\JKECGDBFCB.exe4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\PING.EXEping 2.2.2.2 -n 1 -w 30005⤵
- Runs ping.exe
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Are.docx
mozglue.dll
nss3.dll
JKECGDBFCB.exe
memory/2556-52-0x0000000000400000-0x000000000063B000-memory.dmp
memory/2556-85-0x0000000000400000-0x000000000063B000-memory.dmp
memory/2556-55-0x00000000008B0000-0x00000000008D7000-memory.dmp
memory/2556-59-0x0000000000400000-0x000000000063B000-memory.dmp
memory/2556-1-0x0000000000710000-0x0000000000810000-memory.dmp
memory/2556-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/2556-3-0x0000000000400000-0x000000000063B000-memory.dmp
memory/2556-54-0x0000000000710000-0x0000000000810000-memory.dmp
memory/2556-89-0x0000000000400000-0x000000000063B000-memory.dmp
memory/2556-2-0x00000000008B0000-0x00000000008D7000-memory.dmp
memory/4972-93-0x0000000000260000-0x000000000027E000-memory.dmp
memory/4972-94-0x0000000074780000-0x0000000074F30000-memory.dmp
memory/4972-95-0x0000000004BA0000-0x0000000004BB0000-memory.dmp
memory/4972-97-0x0000000074780000-0x0000000074F30000-memory.dmp
memory/4972-98-0x0000000004BA0000-0x0000000004BB0000-memory.dmp