Analysis
- max time kernel
60s - max time network
61s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
14/12/2022, 17:47
General
- Target file.exe
- Size 2.4MB
- Sample221214-wct85ade3w
- SHA256 91d62a6441d1b638bc4e4427b4ff560c1644853e3da00de23cee2f9ce5b60e09
Malware Config
Extracted
-
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-M63AV.tmp\is-BBIMG.tmp"C:\Users\Admin\AppData\Local\Temp\is-M63AV.tmp\is-BBIMG.tmp" /SL4 $60122 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2283958 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\nyFolders.exe"C:\Program Files (x86)\PrintFolders\nyFolders.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}\IGTp928AGq.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "nyFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\nyFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "nyFolders.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
nyFolders.exe
nyFolders.exe
is-BBIMG.tmp
is-BBIMG.tmp
IGTp928AGq.exe
IGTp928AGq.exe
nyFolders.exe
nyFolders.exe
nyFolders.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-BBIMG.tmp
IGTp928AGq.exe
IGTp928AGq.exe
IGTp928AGq.exe
memory/816-98-0x0000000000400000-0x0000000000439000-memory.dmp
memory/816-54-0x0000000075DF1000-0x0000000075DF3000-memory.dmp
memory/816-71-0x0000000000400000-0x0000000000439000-memory.dmp
memory/816-55-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1120-73-0x0000000002F50000-0x00000000040E6000-memory.dmp
memory/1120-90-0x0000000002F50000-0x00000000040E6000-memory.dmp
memory/1544-77-0x0000000000400000-0x0000000001596000-memory.dmp
memory/1544-78-0x0000000000400000-0x0000000001596000-memory.dmp
memory/1544-76-0x0000000001C00000-0x0000000002D96000-memory.dmp
memory/1544-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1544-75-0x0000000001C00000-0x0000000002D96000-memory.dmp
memory/1544-91-0x0000000000400000-0x0000000001596000-memory.dmp
memory/1544-92-0x0000000000400000-0x0000000001596000-memory.dmp
memory/1544-96-0x0000000000400000-0x0000000001596000-memory.dmp
memory/1544-74-0x0000000000400000-0x0000000001596000-memory.dmp