Analysis
- max time kernel
84s - max time network
102s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
21/11/2022, 21:32
General
- Target file.exe
- Size 1.3MB
- Sample221121-1dletsge95
- SHA256 b2048219ca9ec58e36499f7159bf02f89f5a8ea2d022cd4eecf98ce502fccda3
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-II3TD.tmp\is-4ABUU.tmp"C:\Users\Admin\AppData\Local\Temp\is-II3TD.tmp\is-4ABUU.tmp" /SL4 $70124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1117182 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}\r3NzdM7tUbx6U.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-4ABUU.tmp
is-4ABUU.tmp
r3NzdM7tUbx6U.exe
r3NzdM7tUbx6U.exe
PrintFolders.exe
PrintFolders.exe
PrintFolders.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-4ABUU.tmp
r3NzdM7tUbx6U.exe
r3NzdM7tUbx6U.exe
r3NzdM7tUbx6U.exe
memory/520-75-0x0000000001880000-0x00000000027FF000-memory.dmp
memory/520-87-0x0000000000400000-0x000000000137F000-memory.dmp
memory/520-97-0x0000000000400000-0x000000000137F000-memory.dmp
memory/520-76-0x0000000001880000-0x00000000027FF000-memory.dmp
memory/520-77-0x0000000000400000-0x000000000137F000-memory.dmp
memory/520-78-0x0000000000400000-0x000000000137F000-memory.dmp
memory/520-89-0x0000000010000000-0x000000001001B000-memory.dmp
memory/520-88-0x0000000001880000-0x00000000027FF000-memory.dmp
memory/520-74-0x0000000000400000-0x000000000137F000-memory.dmp
memory/1704-55-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1704-65-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1704-54-0x0000000075671000-0x0000000075673000-memory.dmp
memory/1704-98-0x0000000000400000-0x0000000000413000-memory.dmp
memory/2008-86-0x0000000002F10000-0x0000000003E8F000-memory.dmp
memory/2008-73-0x0000000002F10000-0x0000000003E8F000-memory.dmp