nymaim | 1b791006a7e6e884489c02fa3b3d4a8e0bead8f245bd4e5c8c73da0831278c1e

Analysis

max time kernel
119s
max time network
122s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
28/09/2022, 11:13

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General

Target
file.exe
Size 383KB
Sample220928-nbehaaggfn
SHA256 1b791006a7e6e884489c02fa3b3d4a8e0bead8f245bd4e5c8c73da0831278c1e
MD5 27d460d0e1293c7e02f81a158289f52e
SHA1 ece31259fad90230700c473ac2de91a6f8c37091
SHA512 4bccaebdf48139e81fa87401bf7574a1a581fca1bff4eb3f5cd920d74241b6d596211da4d5bab9753fb294081d2cc2b0d0ad03d1e144729d7d5fe2c74b492326
SSDEEP 6144:F7AF+KeOuZfeD2WA+UQfyTm6jr46jnajfZu6C290j0FFigavwVfIf:FMYPXfeD5A+Ur66jr46eZC29/FIRf
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

nymaim trojan

Malware Config

Extracted

Family

nymaim

208.67.104.97
85.31.46.167

Signatures

NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
trojan nymaim
Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
784	Cleaner.exe

Deletes itself 1 IoCs

pid	Process
1040	cmd.exe

Loads dropped DLL 1 IoCs

pid	Process
1016	cmd.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
472	784	WerFault.exe	31

Kills process with taskkill 1 IoCs

evasion

pid	Process
1364	taskkill.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1836	file.exe
1836	file.exe
1836	file.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	784	Cleaner.exe
Token: SeDebugPrivilege	1364	taskkill.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 1836 wrote to memory of 1016	1836	file.exe	29
PID 1836 wrote to memory of 1016	1836	file.exe	29
PID 1836 wrote to memory of 1016	1836	file.exe	29
PID 1836 wrote to memory of 1016	1836	file.exe	29
PID 1016 wrote to memory of 784	1016	cmd.exe	31
PID 1016 wrote to memory of 784	1016	cmd.exe	31
PID 1016 wrote to memory of 784	1016	cmd.exe	31
PID 1016 wrote to memory of 784	1016	cmd.exe	31
PID 784 wrote to memory of 472	784	Cleaner.exe	33
PID 784 wrote to memory of 472	784	Cleaner.exe	33
PID 784 wrote to memory of 472	784	Cleaner.exe	33
PID 1836 wrote to memory of 1040	1836	file.exe	34
PID 1836 wrote to memory of 1040	1836	file.exe	34
PID 1836 wrote to memory of 1040	1836	file.exe	34
PID 1836 wrote to memory of 1040	1836	file.exe	34
PID 1040 wrote to memory of 1364	1040	cmd.exe	36
PID 1040 wrote to memory of 1364	1040	cmd.exe	36
PID 1040 wrote to memory of 1364	1040	cmd.exe	36
PID 1040 wrote to memory of 1364	1040	cmd.exe	36

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1836
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c start /I "" "C:\Users\Admin\AppData\Local\Temp\tA7YFs7YtqZZSKW77DXHFZxYf3\Cleaner.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1016
- - C:\Users\Admin\AppData\Local\Temp\tA7YFs7YtqZZSKW77DXHFZxYf3\Cleaner.exe
    "C:\Users\Admin\AppData\Local\Temp\tA7YFs7YtqZZSKW77DXHFZxYf3\Cleaner.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:784
  - - C:\Windows\system32\WerFault.exe
      C:\Windows\system32\WerFault.exe -u -p 784 -s 1152
      4⤵
      Program crash
      PID:472
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c taskkill /im "file.exe" /f & erase "C:\Users\Admin\AppData\Local\Temp\file.exe" & exit
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:1040
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /im "file.exe" /f
    3⤵
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:1364

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Web Service

T1102

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

Bunifu_UI_v1.5.3.dll

Path C:\Users\Admin\AppData\Local\Temp\tA7YFs7YtqZZSKW77DXHFZxYf3\Bunifu_UI_v1.5.3.dll
Size 236KB
SHA256 f1b3e0f2750a9103e46a6a4a34f1cf9d17779725f98042cc2475ec66484801cf
MD5 2ecb51ab00c5f340380ecf849291dbcf
SHA1 1a4dffbce2a4ce65495ed79eab42a4da3b660931
SHA512 e241a48eafcaf99187035f0870d24d74ae97fe84aaadd2591cceea9f64b8223d77cfb17a038a58eadd3b822c5201a6f7494f26eea6f77d95f77f6c668d088e6b
SSDEEP 6144:SIQpxILDXGGMO7Ice9C5kQw2hWHcHTykhb:SIQpxILDXGGlET9n/cHG
MD5 SHA1 SHA512 SSDEEP

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Cleaner.exe

Path C:\Users\Admin\AppData\Local\Temp\tA7YFs7YtqZZSKW77DXHFZxYf3\Cleaner.exe
Size 4.2MB
SHA256 663a353b45ed8f3acd4abc429f519635c1cf1294e3b9af98ffe6b1d4937c0e8f
MD5 e89589df13ac2783f322449f63547468
SHA1 bd938f596e09e2ed04c3bc0f0ac68de71e04bcf6
SHA512 9e0126975b32d022b6fe89d4681981e57ef1a3c6375ee2df131ce3527a3ad91c795d75302b78c8fc59651e9e20cebfd177b3278a87f45f8174f9e4ec09fc9cc6
SSDEEP 98304:B3D///UUrPV0vER7ehER7ehER7ehER7ehER7ehER7ehER7ehER7eG:Zacfffffffb
MD5 SHA1 SHA512 SSDEEP

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Cleaner.exe

Path C:\Users\Admin\AppData\Local\Temp\tA7YFs7YtqZZSKW77DXHFZxYf3\Cleaner.exe
Size 4.2MB
SHA256 663a353b45ed8f3acd4abc429f519635c1cf1294e3b9af98ffe6b1d4937c0e8f
MD5 e89589df13ac2783f322449f63547468
SHA1 bd938f596e09e2ed04c3bc0f0ac68de71e04bcf6
SHA512 9e0126975b32d022b6fe89d4681981e57ef1a3c6375ee2df131ce3527a3ad91c795d75302b78c8fc59651e9e20cebfd177b3278a87f45f8174f9e4ec09fc9cc6
SSDEEP 98304:B3D///UUrPV0vER7ehER7ehER7ehER7ehER7ehER7ehER7ehER7eG:Zacfffffffb
MD5 SHA1 SHA512 SSDEEP

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Cleaner.exe

Path \Users\Admin\AppData\Local\Temp\tA7YFs7YtqZZSKW77DXHFZxYf3\Cleaner.exe
Size 4.2MB
SHA256 663a353b45ed8f3acd4abc429f519635c1cf1294e3b9af98ffe6b1d4937c0e8f
MD5 e89589df13ac2783f322449f63547468
SHA1 bd938f596e09e2ed04c3bc0f0ac68de71e04bcf6
SHA512 9e0126975b32d022b6fe89d4681981e57ef1a3c6375ee2df131ce3527a3ad91c795d75302b78c8fc59651e9e20cebfd177b3278a87f45f8174f9e4ec09fc9cc6
SSDEEP 98304:B3D///UUrPV0vER7ehER7ehER7ehER7ehER7ehER7ehER7ehER7eG:Zacfffffffb
MD5 SHA1 SHA512 SSDEEP

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memory/784-67-0x0000000000540000-0x0000000000582000-memory.dmp

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memory/784-65-0x000007FEFB6A1000-0x000007FEFB6A3000-memory.dmp

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memory/784-64-0x00000000002B0000-0x0000000000432000-memory.dmp

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memory/1836-54-0x0000000000508000-0x000000000052F000-memory.dmp

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memory/1836-58-0x0000000000400000-0x0000000000465000-memory.dmp

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memory/1836-56-0x0000000000508000-0x000000000052F000-memory.dmp

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memory/1836-57-0x00000000002B0000-0x00000000002EF000-memory.dmp

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memory/1836-68-0x0000000000508000-0x000000000052F000-memory.dmp

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memory/1836-69-0x0000000000400000-0x0000000000465000-memory.dmp

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memory/1836-55-0x0000000075771000-0x0000000075773000-memory.dmp

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memory/1836-71-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/1836-76-0x0000000000508000-0x000000000052F000-memory.dmp

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memory/1836-77-0x0000000000400000-0x0000000000465000-memory.dmp

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