nymaim | f9bf3b60aec48d8e4d2b98faeaaea165386a9d91445006e1084e2b263e04ea3e

General

Target

file.exe
Size

1.9MB
MD5

54ec2f4418119a4f3325df0c653cfadb
SHA1

88c77bdef561c3d5fb5aefc14c8d0da08c6cf79c
SHA256

f9bf3b60aec48d8e4d2b98faeaaea165386a9d91445006e1084e2b263e04ea3e
SHA512

2f22ea682bad99acbcf5bdfb96c3bc1ae8392ecb0becac822793d88f7c5a7f480fd0db84768158bb4d9f44f68989115cda71f90eae7a3119aa16c1c931e71381
SSDEEP

49152:jGweKXfyEdv2XaLecXrI6lO0ftNwplIioFgUEAoLWP7p3y:jHekz0qLecbIwftaTb2gkKGdy

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
4972	is-06338.tmp
4600	SplitFiles118.exe
2368	gNTrU0V4ja.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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	SplitFiles118.exe

Loads dropped DLL 1 IoCs

pid	Process
4972	is-06338.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\is-CJ065.tmp	is-06338.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\language\is-T7DJ7.tmp	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\language\is-G3SQG.tmp	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\language\is-9K88M.tmp	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\language\is-JO8LB.tmp	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\is-2O0H7.tmp	is-06338.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles118.exe	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\is-GVPR8.tmp	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\is-R1SFG.tmp	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\language\is-T72Q0.tmp	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\language\is-V2C4T.tmp	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\language\is-8RD41.tmp	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\language\is-4I7LQ.tmp	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\language\is-L30U0.tmp	is-06338.tmp
File created	C:\Program Files (x86)\Split Files\is-IJGU0.tmp	is-06338.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
4152	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4600	SplitFiles118.exe
4600	SplitFiles118.exe
4600	SplitFiles118.exe
4600	SplitFiles118.exe
4600	SplitFiles118.exe
4600	SplitFiles118.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4152	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4584 wrote to memory of 4972	4584	file.exe	76
PID 4584 wrote to memory of 4972	4584	file.exe	76
PID 4584 wrote to memory of 4972	4584	file.exe	76
PID 4972 wrote to memory of 4600	4972	is-06338.tmp	77
PID 4972 wrote to memory of 4600	4972	is-06338.tmp	77
PID 4972 wrote to memory of 4600	4972	is-06338.tmp	77
PID 4600 wrote to memory of 2368	4600	SplitFiles118.exe	79
PID 4600 wrote to memory of 2368	4600	SplitFiles118.exe	79
PID 4600 wrote to memory of 2368	4600	SplitFiles118.exe	79
PID 4600 wrote to memory of 4448	4600	SplitFiles118.exe	88
PID 4600 wrote to memory of 4448	4600	SplitFiles118.exe	88
PID 4600 wrote to memory of 4448	4600	SplitFiles118.exe	88
PID 4448 wrote to memory of 4152	4448	cmd.exe	90
PID 4448 wrote to memory of 4152	4448	cmd.exe	90
PID 4448 wrote to memory of 4152	4448	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:4584
- C:\Users\Admin\AppData\Local\Temp\is-OTHUF.tmp\is-06338.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-OTHUF.tmp\is-06338.tmp" /SL4 $7005E "C:\Users\Admin\AppData\Local\Temp\file.exe" 1786706 133120
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4972
- - C:\Program Files (x86)\Split Files\SplitFiles118.exe
    "C:\Program Files (x86)\Split Files\SplitFiles118.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4600
  - - C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\gNTrU0V4ja.exe
      4⤵
      Executes dropped EXE
      PID:2368
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles118.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles118.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4448
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles118.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4152

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

Loading Replay Monitor...

Downloads

C:\Program Files (x86)\Split Files\SplitFiles118.exe

Filesize
3.3MB

MD5
00c31be3850344852c04a5f2a5e498a8

SHA1
4da19d4726a39eaa2dbde719e4843c5638897589

SHA256
cfb69e1b7ea3ebca3c0e5ebd2960b06df4d9273017eed985785f0223d853d77d

SHA512
df01450a1250a9afb164bf8cc2e748c569b1c1bd9141b1811d08ee0d34773a263529c12c4d9bd542bd57fa2539b29fbf4531539197d5308079ec4d3bafe38a45

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles118.exe

Filesize
3.3MB

MD5
00c31be3850344852c04a5f2a5e498a8

SHA1
4da19d4726a39eaa2dbde719e4843c5638897589

SHA256
cfb69e1b7ea3ebca3c0e5ebd2960b06df4d9273017eed985785f0223d853d77d

SHA512
df01450a1250a9afb164bf8cc2e748c569b1c1bd9141b1811d08ee0d34773a263529c12c4d9bd542bd57fa2539b29fbf4531539197d5308079ec4d3bafe38a45

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-OTHUF.tmp\is-06338.tmp

Filesize
723KB

MD5
703b4da86c2d38881230d26bc1051cb2

SHA1
13b9e7582e94cb6e4f703bc08a28c53cdc003019

SHA256
90b8f255f68be9f092608be15074b6fc3c4be724ae82dae5adb390307b121c89

SHA512
e3d80bc78b41e24450effe46f713e9bf7fcd376141a3c6b3f20e3ec81c9c3ab85d300104b2dbbef9512f92a2b613dbc326899e442dc669490c1e192f79a7363b

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-OTHUF.tmp\is-06338.tmp

Filesize
723KB

MD5
703b4da86c2d38881230d26bc1051cb2

SHA1
13b9e7582e94cb6e4f703bc08a28c53cdc003019

SHA256
90b8f255f68be9f092608be15074b6fc3c4be724ae82dae5adb390307b121c89

SHA512
e3d80bc78b41e24450effe46f713e9bf7fcd376141a3c6b3f20e3ec81c9c3ab85d300104b2dbbef9512f92a2b613dbc326899e442dc669490c1e192f79a7363b

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-UC482.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\gNTrU0V4ja.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\gNTrU0V4ja.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/4584-132-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download
memory/4584-155-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download
memory/4584-134-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download
memory/4600-143-0x0000000000400000-0x000000000154D000-memory.dmp

Filesize
17.3MB

Download
memory/4600-147-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/4600-151-0x0000000000400000-0x000000000154D000-memory.dmp

Filesize
17.3MB

Download
memory/4600-142-0x0000000000400000-0x000000000154D000-memory.dmp

Filesize
17.3MB

Download
memory/4600-154-0x0000000000400000-0x000000000154D000-memory.dmp

Filesize
17.3MB

Download

Analysis

Sharing