Analysis
- max time kernel
59s - max time network
63s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
10/12/2022, 01:01
General
- Target file.exe
- Size 2.1MB
- Sample221210-bc8fjaef98
- SHA256 87d17cd40634bda010879b081599b5b1522a6eff6c8fd73e49cb3c2e8e74b312
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-5T4TN.tmp\is-NDE3H.tmp"C:\Users\Admin\AppData\Local\Temp\is-5T4TN.tmp\is-NDE3H.tmp" /SL4 $A011C "C:\Users\Admin\AppData\Local\Temp\file.exe" 1970811 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\ntFolders.exe"C:\Program Files (x86)\PrintFolders\ntFolders.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}\B9AL2wfQL.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "ntFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\ntFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "ntFolders.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
ntFolders.exe
ntFolders.exe
is-NDE3H.tmp
is-NDE3H.tmp
B9AL2wfQL.exe
B9AL2wfQL.exe
ntFolders.exe
ntFolders.exe
ntFolders.exe
is-NDE3H.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
B9AL2wfQL.exe
B9AL2wfQL.exe
B9AL2wfQL.exe
memory/620-65-0x0000000000400000-0x000000000041E000-memory.dmp
memory/620-54-0x0000000075711000-0x0000000075713000-memory.dmp
memory/620-99-0x0000000000400000-0x000000000041E000-memory.dmp
memory/620-55-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1312-73-0x00000000031E0000-0x000000000431F000-memory.dmp
memory/1312-90-0x00000000031E0000-0x000000000431F000-memory.dmp
memory/1904-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1904-77-0x0000000000400000-0x000000000153F000-memory.dmp
memory/1904-74-0x0000000000400000-0x000000000153F000-memory.dmp
memory/1904-78-0x0000000000400000-0x000000000153F000-memory.dmp
memory/1904-91-0x0000000000400000-0x000000000153F000-memory.dmp
memory/1904-92-0x0000000001A60000-0x0000000002B9F000-memory.dmp
memory/1904-93-0x0000000000400000-0x000000000153F000-memory.dmp
memory/1904-76-0x0000000001A60000-0x0000000002B9F000-memory.dmp
memory/1904-97-0x0000000000400000-0x000000000153F000-memory.dmp
memory/1904-75-0x0000000001A60000-0x0000000002B9F000-memory.dmp