nymaim | f825e65ca0525c1a7eafc517d2077859c2d27fd76b7d15bbb6f55892fcba864a

General

Target

file.exe
Size

2.1MB
MD5

b15b29b122f2a560beca0328a02b63d4
SHA1

ec9b566137ae4973362b17ce8e9d0459902d3c85
SHA256

f825e65ca0525c1a7eafc517d2077859c2d27fd76b7d15bbb6f55892fcba864a
SHA512

aa9c2453b64e2832372c68e1e38b230ac90dd3575dbc012df5785dd0616176158c52b823ece83d14608b6f1748df2682d1b7efd0210ac6d14df2e0f4370b4312
SSDEEP

49152:6Gh08bqoNdSsAS5RBdN0X4xkVodropKX3AJTinSgzxa:6G08WYBWX4kerJETiq

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
4828	is-3784P.tmp
1520	SplitFiles121.exe
1696	ANiiGhj7iny5S.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	SplitFiles121.exe

Loads dropped DLL 1 IoCs

pid	Process
4828	is-3784P.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-JAPSF.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\language\is-KR2GP.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\is-P9RES.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\is-KSD2A.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\is-KUH7H.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\language\is-828L4.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\language\is-0LMFT.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\language\is-2NVQJ.tmp	is-3784P.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\is-JNT43.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\language\is-AAJ19.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\is-VKR4I.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\language\is-7PQLH.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\language\is-TVICV.tmp	is-3784P.tmp
File created	C:\Program Files (x86)\Split Files\language\is-PERDL.tmp	is-3784P.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles121.exe	is-3784P.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
4200	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1520	SplitFiles121.exe
1520	SplitFiles121.exe
1520	SplitFiles121.exe
1520	SplitFiles121.exe
1520	SplitFiles121.exe
1520	SplitFiles121.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4200	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4852 wrote to memory of 4828	4852	file.exe	81
PID 4852 wrote to memory of 4828	4852	file.exe	81
PID 4852 wrote to memory of 4828	4852	file.exe	81
PID 4828 wrote to memory of 1520	4828	is-3784P.tmp	82
PID 4828 wrote to memory of 1520	4828	is-3784P.tmp	82
PID 4828 wrote to memory of 1520	4828	is-3784P.tmp	82
PID 1520 wrote to memory of 1696	1520	SplitFiles121.exe	83
PID 1520 wrote to memory of 1696	1520	SplitFiles121.exe	83
PID 1520 wrote to memory of 1696	1520	SplitFiles121.exe	83
PID 1520 wrote to memory of 3276	1520	SplitFiles121.exe	91
PID 1520 wrote to memory of 3276	1520	SplitFiles121.exe	91
PID 1520 wrote to memory of 3276	1520	SplitFiles121.exe	91
PID 3276 wrote to memory of 4200	3276	cmd.exe	93
PID 3276 wrote to memory of 4200	3276	cmd.exe	93
PID 3276 wrote to memory of 4200	3276	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4852
- C:\Users\Admin\AppData\Local\Temp\is-JJMDF.tmp\is-3784P.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-JJMDF.tmp\is-3784P.tmp" /SL4 $701C8 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1979821 316928
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4828
- - C:\Program Files (x86)\Split Files\SplitFiles121.exe
    "C:\Program Files (x86)\Split Files\SplitFiles121.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:1520
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\ANiiGhj7iny5S.exe
      4⤵
      Executes dropped EXE
      PID:1696
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles121.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles121.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3276
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles121.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4200

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\SplitFiles121.exe

Filesize
3.5MB

MD5
69e76fbddcf8ac7c490a51b4e8319efb

SHA1
99c37adef8cb393692bee535f6d4eb9d357a4b7a

SHA256
c29f338c28bc8a86a996c5c3f9db2446d6e800ec65f0bb834f9ce2db17b845d3

SHA512
c0668321c5a2360a88aef01a8cee1c6d945dcdee325618688d6a1241ea9e88c3a10812da9df18648c74b02cfb41dbf45af071dbf0a8424b68e0198a8cd8c7dec

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles121.exe

Filesize
3.5MB

MD5
69e76fbddcf8ac7c490a51b4e8319efb

SHA1
99c37adef8cb393692bee535f6d4eb9d357a4b7a

SHA256
c29f338c28bc8a86a996c5c3f9db2446d6e800ec65f0bb834f9ce2db17b845d3

SHA512
c0668321c5a2360a88aef01a8cee1c6d945dcdee325618688d6a1241ea9e88c3a10812da9df18648c74b02cfb41dbf45af071dbf0a8424b68e0198a8cd8c7dec

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-8QBAS.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-JJMDF.tmp\is-3784P.tmp

Filesize
903KB

MD5
0e214ed840148aacdcd0cc4792acf0c3

SHA1
8731e1007a87b7be4a57db4f84aedab8a212eb37

SHA256
42e06dc9acbfbbf3b9d69fb4f841b4153a69ab30d2ba9299e16ca765f271f9ca

SHA512
0381cece20c597b47b1622b7f56609c76774612ea31c9ceceab29708181976682195d0935f91e08f455e6dc45cee3d2504fb6c0948480be3c6f8c75e0b59c42f

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-JJMDF.tmp\is-3784P.tmp

Filesize
903KB

MD5
0e214ed840148aacdcd0cc4792acf0c3

SHA1
8731e1007a87b7be4a57db4f84aedab8a212eb37

SHA256
42e06dc9acbfbbf3b9d69fb4f841b4153a69ab30d2ba9299e16ca765f271f9ca

SHA512
0381cece20c597b47b1622b7f56609c76774612ea31c9ceceab29708181976682195d0935f91e08f455e6dc45cee3d2504fb6c0948480be3c6f8c75e0b59c42f

Download Submit
C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\ANiiGhj7iny5S.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\ANiiGhj7iny5S.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/1520-142-0x0000000000400000-0x0000000001583000-memory.dmp

Filesize
17.5MB

Download
memory/1520-153-0x0000000000400000-0x0000000001583000-memory.dmp

Filesize
17.5MB

Download
memory/1520-143-0x0000000000400000-0x0000000001583000-memory.dmp

Filesize
17.5MB

Download
memory/1520-156-0x0000000000400000-0x0000000001583000-memory.dmp

Filesize
17.5MB

Download
memory/1520-144-0x0000000000400000-0x0000000001583000-memory.dmp

Filesize
17.5MB

Download
memory/1520-148-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/4852-134-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/4852-152-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/4852-132-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/4852-157-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download

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