Analysis
- max time kernel
63s - max time network
66s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
15/12/2022, 15:02
General
- Target file.exe
- Size 2.2MB
- Sample221215-sefa7sfe9x
- SHA256 404b6fd0d019e07775b642488de23bdabab6ad891e277cd63cd7eb0be70f07c8
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-N8QPG.tmp\is-0D5FE.tmp"C:\Users\Admin\AppData\Local\Temp\is-N8QPG.tmp\is-0D5FE.tmp" /SL4 $60126 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2073781 2088962⤵
- 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\nzFolders.exe"C:\Program Files (x86)\PrintFolders\nzFolders.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}\nMhVHSZfWT.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "nzFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\nzFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "nzFolders.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
nzFolders.exe
nzFolders.exe
is-0D5FE.tmp
is-0D5FE.tmp
nMhVHSZfWT.exe
nMhVHSZfWT.exe
nzFolders.exe
nzFolders.exe
nzFolders.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-0D5FE.tmp
nMhVHSZfWT.exe
nMhVHSZfWT.exe
nMhVHSZfWT.exe
memory/1092-86-0x00000000030C0000-0x0000000004208000-memory.dmp
memory/1092-73-0x00000000030C0000-0x0000000004208000-memory.dmp
memory/1476-65-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1476-54-0x0000000075E51000-0x0000000075E53000-memory.dmp
memory/1476-98-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1476-55-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1932-75-0x0000000001EA0000-0x0000000002FE8000-memory.dmp
memory/1932-74-0x0000000000400000-0x0000000001548000-memory.dmp
memory/1932-78-0x0000000000400000-0x0000000001548000-memory.dmp
memory/1932-87-0x0000000000400000-0x0000000001548000-memory.dmp
memory/1932-88-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1932-92-0x0000000000400000-0x0000000001548000-memory.dmp
memory/1932-76-0x0000000001EA0000-0x0000000002FE8000-memory.dmp
memory/1932-96-0x0000000000400000-0x0000000001548000-memory.dmp
memory/1932-77-0x0000000000400000-0x0000000001548000-memory.dmp