Analysis
- max time kernel
61s - max time network
65s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
21/12/2022, 04:16
General
- Target file.exe
- Size 1.6MB
- Sample221221-evs1caef91
- SHA256 0b98805c18e5784fa2f3e64ed231d352083c2e14ec513cfbdc48441d54fe6079
Malware Config
Extracted
-
nymaim
-
45.139.105.171
-
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 17 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
-
C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\is-4Q1Q1.tmp\is-Q1ARI.tmp"C:\Users\Admin\AppData\Local\Temp\is-4Q1Q1.tmp\is-Q1ARI.tmp" /SL4 $80022 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1472114 517122⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\Split Files\SplitFiles116.exe"C:\Program Files (x86)\Split Files\SplitFiles116.exe"3⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\ct1c9aFP4s.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles116.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles116.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles116.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
SplitFiles116.exe
SplitFiles116.exe
is-Q1ARI.tmp
is-Q1ARI.tmp
ct1c9aFP4s.exe
ct1c9aFP4s.exe
SplitFiles116.exe
SplitFiles116.exe
SplitFiles116.exe
is-Q1ARI.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
ct1c9aFP4s.exe
ct1c9aFP4s.exe
ct1c9aFP4s.exe
memory/928-89-0x0000000001B30000-0x0000000002C3C000-memory.dmp
memory/928-94-0x0000000000400000-0x000000000150C000-memory.dmp
memory/928-76-0x0000000001B30000-0x0000000002C3C000-memory.dmp
memory/928-77-0x0000000000400000-0x000000000150C000-memory.dmp
memory/928-78-0x0000000000400000-0x000000000150C000-memory.dmp
memory/928-98-0x0000000000400000-0x000000000150C000-memory.dmp
memory/928-74-0x0000000000400000-0x000000000150C000-memory.dmp
memory/928-87-0x0000000000400000-0x000000000150C000-memory.dmp
memory/928-90-0x0000000010000000-0x000000001001B000-memory.dmp
memory/928-75-0x0000000001B30000-0x0000000002C3C000-memory.dmp
memory/928-88-0x0000000001B30000-0x0000000002C3C000-memory.dmp
memory/1596-86-0x0000000003870000-0x000000000497C000-memory.dmp
memory/1596-73-0x0000000003870000-0x000000000497C000-memory.dmp
memory/1604-54-0x0000000076461000-0x0000000076463000-memory.dmp
memory/1604-55-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1604-68-0x0000000000400000-0x0000000000413000-memory.dmp
memory/1604-100-0x0000000000400000-0x0000000000413000-memory.dmp