Analysis
- max time kernel
150s - max time network
125s - platform
windows7_x64 - resource
win7-20240221-en - resource tags
- submitted
15/03/2024, 04:24
General
- Target $TEMP/InstallSetup_two.exe
- Size 388KB
- Sample240315-e1meragb6s
- SHA256 5a62584d8b61c9e23281990a954f497b238dc12509e81bf8de1b1b9bf10141fc
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
- Executes dropped EXE 3 IoCs
- Loads dropped DLL 12 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.
- UPX packed file 4 IoCs
Detects executables packed with UPX/modified UPX open source packer.
- 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.
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Runs ping.exe 1 TTPs 1 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 40 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\$TEMP\InstallSetup_two.exe"C:\Users\Admin\AppData\Local\Temp\$TEMP\InstallSetup_two.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\u27s.0.exe"C:\Users\Admin\AppData\Local\Temp\u27s.0.exe"2⤵
- Executes dropped EXE
- 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\FBFHJJJDAF.exe"3⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\FBFHJJJDAF.exe"C:\Users\Admin\AppData\Local\Temp\FBFHJJJDAF.exe"4⤵
- 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\FBFHJJJDAF.exe5⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\PING.EXEping 2.2.2.2 -n 1 -w 30006⤵
- Runs ping.exe
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\JJKEBGHJKF.exe"3⤵
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C:\Users\Admin\AppData\Local\Temp\u27s.1.exe"C:\Users\Admin\AppData\Local\Temp\u27s.1.exe"2⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.execmd /c ""C:\Users\Admin\AppData\Roaming\Temp\Task.bat" "3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\chcp.comchcp 12514⤵
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C:\Windows\SysWOW64\schtasks.exeschtasks /create /tn "MalayamaraUpdate" /tr "'C:\Users\Admin\AppData\Local\Temp\Updater.exe'" /sc minute /mo 30 /F4⤵
- Creates scheduled task(s)
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
FBFHJJJDAF.exe
Task.bat
mozglue.dll
nss3.dll
u27s.0.exe
u27s.1.exe
memory/1100-167-0x00000000022B0000-0x00000000022B1000-memory.dmp
memory/1196-123-0x0000000000400000-0x000000000063B000-memory.dmp
memory/1196-127-0x0000000000400000-0x000000000063B000-memory.dmp
memory/1196-100-0x0000000000400000-0x000000000063B000-memory.dmp
memory/1196-42-0x0000000000230000-0x0000000000330000-memory.dmp
memory/1196-43-0x00000000003A0000-0x00000000003C7000-memory.dmp
memory/1196-44-0x0000000000400000-0x000000000063B000-memory.dmp
memory/1196-45-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/1196-131-0x0000000000230000-0x0000000000330000-memory.dmp
memory/2056-178-0x00000000719C0000-0x00000000720AE000-memory.dmp
memory/2056-154-0x00000000719C0000-0x00000000720AE000-memory.dmp
memory/2056-143-0x0000000000E40000-0x0000000000E5E000-memory.dmp
memory/2056-171-0x0000000004D20000-0x0000000004D60000-memory.dmp
memory/2056-179-0x0000000004D20000-0x0000000004D60000-memory.dmp
memory/2644-40-0x0000000000230000-0x0000000000231000-memory.dmp
memory/2644-101-0x0000000000400000-0x0000000000930000-memory.dmp
memory/2644-165-0x0000000000230000-0x0000000000231000-memory.dmp
memory/2644-39-0x0000000000400000-0x0000000000930000-memory.dmp
memory/2644-176-0x0000000000400000-0x0000000000930000-memory.dmp
memory/2872-2-0x0000000000330000-0x0000000000397000-memory.dmp
memory/2872-3-0x0000000000400000-0x000000000046E000-memory.dmp
memory/2872-1-0x0000000000550000-0x0000000000650000-memory.dmp
memory/2872-36-0x0000000003110000-0x0000000003640000-memory.dmp
memory/2872-35-0x0000000000400000-0x000000000046E000-memory.dmp
memory/2872-34-0x0000000003110000-0x0000000003640000-memory.dmp