Analysis
- max time kernel
58s - max time network
60s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
15/12/2022, 16:17
General
- Target file.exe
- Size 2.2MB
- Sample221215-trclhsfg2x
- SHA256 70eca4a5d39e688f3be1ee36f5ddf0ccdaece0954c1afac0432aa6615ddce540
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-F2GEO.tmp\is-03JS4.tmp"C:\Users\Admin\AppData\Local\Temp\is-F2GEO.tmp\is-03JS4.tmp" /SL4 $7011E "C:\Users\Admin\AppData\Local\Temp\file.exe" 2078627 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}\hVvYfAC2.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-03JS4.tmp
is-03JS4.tmp
hVvYfAC2.exe
hVvYfAC2.exe
nzFolders.exe
nzFolders.exe
nzFolders.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-03JS4.tmp
hVvYfAC2.exe
hVvYfAC2.exe
hVvYfAC2.exe
memory/764-75-0x0000000001BF0000-0x0000000002D38000-memory.dmp
memory/764-93-0x0000000000400000-0x0000000001548000-memory.dmp
memory/764-98-0x0000000000400000-0x0000000001548000-memory.dmp
memory/764-76-0x0000000001BF0000-0x0000000002D38000-memory.dmp
memory/764-77-0x0000000000400000-0x0000000001548000-memory.dmp
memory/764-78-0x0000000000400000-0x0000000001548000-memory.dmp
memory/764-92-0x0000000001BF0000-0x0000000002D38000-memory.dmp
memory/764-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/764-74-0x0000000000400000-0x0000000001548000-memory.dmp
memory/764-91-0x0000000000400000-0x0000000001548000-memory.dmp
memory/1700-55-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1700-65-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1700-54-0x0000000075FF1000-0x0000000075FF3000-memory.dmp
memory/1700-99-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1708-90-0x0000000003080000-0x00000000041C8000-memory.dmp
memory/1708-73-0x0000000003080000-0x00000000041C8000-memory.dmp