Analysis
- max time kernel
66s - max time network
69s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
13/12/2022, 18:01
General
- Target file.exe
- Size 2.4MB
- Sample221213-wlwhjsfc93
- SHA256 7cb4db450b9a45b77d0913c1a35ff79a68985b114e89e3497b236a9b5d1e55dc
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-LNOJF.tmp\is-43EMA.tmp"C:\Users\Admin\AppData\Local\Temp\is-LNOJF.tmp\is-43EMA.tmp" /SL4 $60120 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2227579 1704962⤵
- 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\nxFolders.exe"C:\Program Files (x86)\PrintFolders\nxFolders.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}\ihybdiY1iHrc.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "nxFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\nxFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "nxFolders.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
nxFolders.exe
nxFolders.exe
is-43EMA.tmp
is-43EMA.tmp
ihybdiY1iHrc.exe
ihybdiY1iHrc.exe
nxFolders.exe
nxFolders.exe
nxFolders.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-43EMA.tmp
ihybdiY1iHrc.exe
ihybdiY1iHrc.exe
ihybdiY1iHrc.exe
memory/696-73-0x00000000030B0000-0x000000000423B000-memory.dmp
memory/696-86-0x00000000030B0000-0x000000000423B000-memory.dmp
memory/888-75-0x0000000001C00000-0x0000000002D8B000-memory.dmp
memory/888-77-0x0000000000400000-0x000000000158B000-memory.dmp
memory/888-96-0x0000000000400000-0x000000000158B000-memory.dmp
memory/888-76-0x0000000001C00000-0x0000000002D8B000-memory.dmp
memory/888-92-0x0000000000400000-0x000000000158B000-memory.dmp
memory/888-74-0x0000000000400000-0x000000000158B000-memory.dmp
memory/888-78-0x0000000000400000-0x000000000158B000-memory.dmp
memory/888-88-0x0000000010000000-0x000000001001B000-memory.dmp
memory/888-87-0x0000000000400000-0x000000000158B000-memory.dmp
memory/1504-65-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1504-54-0x00000000768A1000-0x00000000768A3000-memory.dmp
memory/1504-55-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1504-98-0x0000000000400000-0x0000000000430000-memory.dmp