Analysis
- max time kernel
116s - max time network
153s - platform
windows7_x64 - resource
win7-20221111-en - resource tags
- submitted
12/12/2022, 08:16
General
- Target file.exe
- Size 2.1MB
- Sample221212-j55jcaah43
- SHA256 0d37a10496a3bbb5cd37565829f65b80247f1f00cf53fa766e123c2632e07753
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-PAHJ3.tmp\is-CD05B.tmp"C:\Users\Admin\AppData\Local\Temp\is-PAHJ3.tmp\is-CD05B.tmp" /SL4 $70124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2000396 962562⤵
- 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\nwFolders.exe"C:\Program Files (x86)\PrintFolders\nwFolders.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}\iyV8BLTznzb.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "nwFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\nwFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "nwFolders.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
nwFolders.exe
nwFolders.exe
is-CD05B.tmp
is-CD05B.tmp
iyV8BLTznzb.exe
iyV8BLTznzb.exe
nwFolders.exe
nwFolders.exe
nwFolders.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-CD05B.tmp
iyV8BLTznzb.exe
iyV8BLTznzb.exe
iyV8BLTznzb.exe
memory/524-77-0x0000000000400000-0x000000000155F000-memory.dmp
memory/524-87-0x0000000000400000-0x000000000155F000-memory.dmp
memory/524-75-0x0000000001B40000-0x0000000002C9F000-memory.dmp
memory/524-96-0x0000000000400000-0x000000000155F000-memory.dmp
memory/524-88-0x0000000010000000-0x000000001001B000-memory.dmp
memory/524-78-0x0000000000400000-0x000000000155F000-memory.dmp
memory/524-76-0x0000000001B40000-0x0000000002C9F000-memory.dmp
memory/524-74-0x0000000000400000-0x000000000155F000-memory.dmp
memory/796-86-0x0000000003120000-0x000000000427F000-memory.dmp
memory/796-70-0x0000000003120000-0x000000000427F000-memory.dmp
memory/1380-65-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1380-54-0x00000000764C1000-0x00000000764C3000-memory.dmp
memory/1380-55-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1380-97-0x0000000000400000-0x000000000041E000-memory.dmp