Analysis
- max time kernel
91s - max time network
97s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
30/11/2022, 22:17
General
- Target file.exe
- Size 2.0MB
- Sample221130-17dbbade8s
- SHA256 19bc5c10f2c5687ea4f588ad903bef40d4d6a5a9e6da36e0ea16b3ddfaf98768
Malware Config
Extracted
-
nymaim
-
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-JBL17.tmp\is-BEC6A.tmp"C:\Users\Admin\AppData\Local\Temp\is-JBL17.tmp\is-BEC6A.tmp" /SL4 $70120 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1910886 517122⤵
- 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\PrintFolders.exe"C:\Program Files (x86)\PrintFolders\PrintFolders.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}\FQfiYb.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
-
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "PrintFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\PrintFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "PrintFolders.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
PrintFolders.exe
PrintFolders.exe
is-BEC6A.tmp
is-BEC6A.tmp
FQfiYb.exe
FQfiYb.exe
PrintFolders.exe
PrintFolders.exe
PrintFolders.exe
is-BEC6A.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
FQfiYb.exe
FQfiYb.exe
FQfiYb.exe
memory/368-88-0x0000000001980000-0x0000000002A9B000-memory.dmp
memory/368-75-0x0000000001980000-0x0000000002A9B000-memory.dmp
memory/368-76-0x0000000001980000-0x0000000002A9B000-memory.dmp
memory/368-77-0x0000000000400000-0x000000000151B000-memory.dmp
memory/368-78-0x0000000000400000-0x000000000151B000-memory.dmp
memory/368-95-0x0000000000400000-0x000000000151B000-memory.dmp
memory/368-89-0x0000000010000000-0x000000001001B000-memory.dmp
memory/368-70-0x0000000000400000-0x000000000151B000-memory.dmp
memory/368-87-0x0000000000400000-0x000000000151B000-memory.dmp
memory/1924-86-0x0000000002F70000-0x000000000408B000-memory.dmp
memory/1924-69-0x0000000002F70000-0x000000000408B000-memory.dmp
memory/2028-54-0x0000000075A71000-0x0000000075A73000-memory.dmp
memory/2028-57-0x0000000000400000-0x0000000000413000-memory.dmp
memory/2028-55-0x0000000000400000-0x0000000000413000-memory.dmp
memory/2028-97-0x0000000000400000-0x0000000000413000-memory.dmp