Analysis
- max time kernel
90s - max time network
93s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
09/12/2022, 06:02
General
- Target file.exe
- Size 2.1MB
- Sample221209-grflysce46
- SHA256 8762d59c25f820d3eb0b19612c5d81e7c6557fc85778a1f9d2cdbdba5bdf8cbf
Malware Config
Extracted
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nymaim
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45.139.105.171
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85.31.46.167
Signatures
- NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
- Executes dropped EXE 3 IoCs
- Loads dropped DLL 10 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Drops file in Program Files directory 9 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Kills process with taskkill 1 IoCs
- Suspicious behavior: EnumeratesProcesses 3 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of WriteProcessMemory 35 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\is-B8L08.tmp\is-S873T.tmp"C:\Users\Admin\AppData\Local\Temp\is-B8L08.tmp\is-S873T.tmp" /SL4 $60122 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2005392 962562⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\PrintFolders\ntFolders.exe"C:\Program Files (x86)\PrintFolders\ntFolders.exe"3⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\Kz0fqaTgct.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "ntFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\ntFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "ntFolders.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
ntFolders.exe
ntFolders.exe
is-S873T.tmp
is-S873T.tmp
Kz0fqaTgct.exe
Kz0fqaTgct.exe
ntFolders.exe
ntFolders.exe
ntFolders.exe
is-S873T.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
Kz0fqaTgct.exe
Kz0fqaTgct.exe
Kz0fqaTgct.exe
memory/956-88-0x0000000010000000-0x000000001001B000-memory.dmp
memory/956-76-0x0000000001B60000-0x0000000002C9F000-memory.dmp
memory/956-77-0x0000000000400000-0x000000000153F000-memory.dmp
memory/956-78-0x0000000000400000-0x000000000153F000-memory.dmp
memory/956-75-0x0000000001B60000-0x0000000002C9F000-memory.dmp
memory/956-95-0x0000000000400000-0x000000000153F000-memory.dmp
memory/956-87-0x0000000000400000-0x000000000153F000-memory.dmp
memory/956-74-0x0000000000400000-0x000000000153F000-memory.dmp
memory/1688-54-0x0000000075DF1000-0x0000000075DF3000-memory.dmp
memory/1688-55-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1688-62-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1688-96-0x0000000000400000-0x000000000041E000-memory.dmp
memory/2004-86-0x0000000002F90000-0x00000000040CF000-memory.dmp
memory/2004-73-0x0000000002F90000-0x00000000040CF000-memory.dmp