Analysis
- max time kernel
62s - max time network
64s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
17/12/2022, 12:01
General
- Target file.exe
- Size 2.3MB
- Sample221217-n6wp2sbe3x
- SHA256 afda089c5568fd399669f64ca6db77d1be29dbf566a5a1fcfa9d59ffbeba76bc
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-3I40S.tmp\is-JGVG3.tmp"C:\Users\Admin\AppData\Local\Temp\is-3I40S.tmp\is-JGVG3.tmp" /SL4 $70124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2139743 1694722⤵
- 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\obFolders.exe"C:\Program Files (x86)\PrintFolders\obFolders.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}\7vaG98sLVDGAzU.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "obFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\obFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "obFolders.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
obFolders.exe
obFolders.exe
is-JGVG3.tmp
is-JGVG3.tmp
7vaG98sLVDGAzU.exe
7vaG98sLVDGAzU.exe
obFolders.exe
obFolders.exe
obFolders.exe
is-JGVG3.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
7vaG98sLVDGAzU.exe
7vaG98sLVDGAzU.exe
7vaG98sLVDGAzU.exe
memory/1248-78-0x0000000000400000-0x000000000158A000-memory.dmp
memory/1248-87-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1248-75-0x00000000019E0000-0x0000000002B6A000-memory.dmp
memory/1248-76-0x00000000019E0000-0x0000000002B6A000-memory.dmp
memory/1248-77-0x0000000000400000-0x000000000158A000-memory.dmp
memory/1248-99-0x0000000000400000-0x000000000158A000-memory.dmp
memory/1248-94-0x0000000000400000-0x000000000158A000-memory.dmp
memory/1248-93-0x00000000019E0000-0x0000000002B6A000-memory.dmp
memory/1248-74-0x0000000000400000-0x000000000158A000-memory.dmp
memory/1248-92-0x00000000019E0000-0x0000000002B6A000-memory.dmp
memory/1248-91-0x0000000000400000-0x000000000158A000-memory.dmp
memory/1376-55-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1376-69-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1376-54-0x0000000075091000-0x0000000075093000-memory.dmp
memory/1376-100-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1952-86-0x0000000002F30000-0x00000000040BA000-memory.dmp
memory/1952-73-0x0000000002F30000-0x00000000040BA000-memory.dmp