nymaim | 559be79bc8e07116bdc4060a4ad64d41e65fe497750cf3e63eebd1bd641a036e

General

Target

file.exe
Size

1.9MB
MD5

9cdd10493e0b673dfe1ceadee1ba9c0d
SHA1

eb93eb07eec6db7f9018ecdfe851ab3fed7930b1
SHA256

559be79bc8e07116bdc4060a4ad64d41e65fe497750cf3e63eebd1bd641a036e
SHA512

e36ed9f9c4aa35d5e8e3a45effad7a747d3370b71f9c2edcd0f667ff1bb457c84f451a82b2a641d4c903516adc15e45710fc51d630a69640440617b2e85b2ad9
SSDEEP

49152:CiACiqzBtW2rQr4y9Ift98n6XrjLX/nvYX0FJD:CiACim7Nr5yon8nwrjLvvYuJD

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

C2

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.
trojan nymaim

Executes dropped EXE 3 IoCs

pid	Process
2692	is-NJRJ2.tmp
2064	SplitFiles129.exe
3880	oLnvdnmwZkF.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	SplitFiles129.exe

Loads dropped DLL 1 IoCs

pid	Process
2692	is-NJRJ2.tmp

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Drops file in Program Files directory 17 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Split Files\language\is-B17IG.tmp	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\language\is-BR6FK.tmp	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\is-2535B.tmp	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\is-HA04R.tmp	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\is-JATEH.tmp	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\language\is-32V4G.tmp	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\language\is-ML3C6.tmp	is-NJRJ2.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\language\is-F5AN5.tmp	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\language\is-8B60P.tmp	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\language\is-MS6H0.tmp	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\is-0ABLF.tmp	is-NJRJ2.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles129.exe	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\is-RQ992.tmp	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\language\is-9U5GL.tmp	is-NJRJ2.tmp
File created	C:\Program Files (x86)\Split Files\language\is-LHAPB.tmp	is-NJRJ2.tmp

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

System Information Discovery
T1082

Kills process with taskkill 1 IoCs

evasion

pid	Process
548	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2064	SplitFiles129.exe
2064	SplitFiles129.exe
2064	SplitFiles129.exe
2064	SplitFiles129.exe
2064	SplitFiles129.exe
2064	SplitFiles129.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	548	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1616 wrote to memory of 2692	1616	file.exe	76
PID 1616 wrote to memory of 2692	1616	file.exe	76
PID 1616 wrote to memory of 2692	1616	file.exe	76
PID 2692 wrote to memory of 2064	2692	is-NJRJ2.tmp	77
PID 2692 wrote to memory of 2064	2692	is-NJRJ2.tmp	77
PID 2692 wrote to memory of 2064	2692	is-NJRJ2.tmp	77
PID 2064 wrote to memory of 3880	2064	SplitFiles129.exe	79
PID 2064 wrote to memory of 3880	2064	SplitFiles129.exe	79
PID 2064 wrote to memory of 3880	2064	SplitFiles129.exe	79
PID 2064 wrote to memory of 1124	2064	SplitFiles129.exe	88
PID 2064 wrote to memory of 1124	2064	SplitFiles129.exe	88
PID 2064 wrote to memory of 1124	2064	SplitFiles129.exe	88
PID 1124 wrote to memory of 548	1124	cmd.exe	90
PID 1124 wrote to memory of 548	1124	cmd.exe	90
PID 1124 wrote to memory of 548	1124	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1616
- C:\Users\Admin\AppData\Local\Temp\is-37J81.tmp\is-NJRJ2.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-37J81.tmp\is-NJRJ2.tmp" /SL4 $7014A "C:\Users\Admin\AppData\Local\Temp\file.exe" 1706864 209408
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:2692
- - C:\Program Files (x86)\Split Files\SplitFiles129.exe
    "C:\Program Files (x86)\Split Files\SplitFiles129.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:2064
  - - C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\oLnvdnmwZkF.exe
      4⤵
      Executes dropped EXE
      PID:3880
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles129.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles129.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1124
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles129.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:548

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files (x86)\Split Files\SplitFiles129.exe

Filesize
3.1MB

MD5
b81c852bdfe66524b9e5d4e504160c50

SHA1
b6667ce9bdc74f6ae38fce600759fc8fb30d4e04

SHA256
7948558e73b18a4e03f9e236e8ae89a2b0af4d34e8609d0ff617777574b1f3be

SHA512
4832ea0aa190230a598f0d345c2130b11fd1c3eaf28a60625ce77ffaee411b60d920fc5b3eb9ad8d5e0b6b52bc05bc736fd909363a7ec976693230daeb1e0c50

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles129.exe

Filesize
3.1MB

MD5
b81c852bdfe66524b9e5d4e504160c50

SHA1
b6667ce9bdc74f6ae38fce600759fc8fb30d4e04

SHA256
7948558e73b18a4e03f9e236e8ae89a2b0af4d34e8609d0ff617777574b1f3be

SHA512
4832ea0aa190230a598f0d345c2130b11fd1c3eaf28a60625ce77ffaee411b60d920fc5b3eb9ad8d5e0b6b52bc05bc736fd909363a7ec976693230daeb1e0c50

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-37J81.tmp\is-NJRJ2.tmp

Filesize
798KB

MD5
8d84df7727d14b5e972c0af5b9baca1f

SHA1
37f37fad8bcbad5bc1c8c8e7154eefc9d9f30e65

SHA256
4143e0bcbc451f67a84e95656fb76f35742af5ca40a87cb92da32c282a2ccd6f

SHA512
7de2f690f344bb0a18e728284d2b431f5d44528efec4a015fbc822fe0258611bd9b32cdad8ffd56c6b15384bcff99b906544fe2d726edfa847a22eedbf16a6fe

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-37J81.tmp\is-NJRJ2.tmp

Filesize
798KB

MD5
8d84df7727d14b5e972c0af5b9baca1f

SHA1
37f37fad8bcbad5bc1c8c8e7154eefc9d9f30e65

SHA256
4143e0bcbc451f67a84e95656fb76f35742af5ca40a87cb92da32c282a2ccd6f

SHA512
7de2f690f344bb0a18e728284d2b431f5d44528efec4a015fbc822fe0258611bd9b32cdad8ffd56c6b15384bcff99b906544fe2d726edfa847a22eedbf16a6fe

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-CJ7QE.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\oLnvdnmwZkF.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\oLnvdnmwZkF.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/548-154-0x0000000000000000-mapping.dmp

Download
memory/1124-153-0x0000000000000000-mapping.dmp

Download
memory/1616-156-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/1616-138-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/1616-132-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/2064-143-0x0000000000400000-0x000000000150F000-memory.dmp

Filesize
17.1MB

Download
memory/2064-144-0x0000000000400000-0x000000000150F000-memory.dmp

Filesize
17.1MB

Download
memory/2064-148-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/2064-152-0x0000000000400000-0x000000000150F000-memory.dmp

Filesize
17.1MB

Download
memory/2064-142-0x0000000000400000-0x000000000150F000-memory.dmp

Filesize
17.1MB

Download
memory/2064-139-0x0000000000000000-mapping.dmp

Download
memory/2064-155-0x0000000000400000-0x000000000150F000-memory.dmp

Filesize
17.1MB

Download
memory/2692-134-0x0000000000000000-mapping.dmp

Download
memory/3880-145-0x0000000000000000-mapping.dmp

Download

Analysis

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