nymaim | d82a0347876fdc2504368327445f74608145862f9c6f9d60ee73db698e99ac45

General

Target

file.exe
Size

1.9MB
MD5

426bc2bb6d548cb7af0ac880f8e0a399
SHA1

6b8bc43f3981b814c90b1dd66b363c2d7c065c39
SHA256

d82a0347876fdc2504368327445f74608145862f9c6f9d60ee73db698e99ac45
SHA512

adfcb916f1cb4397713f2e3a4e679f9c49cb76802dac6339ea2d2c8398d9d22303a8b406506e2f2750515082e95e7ce3b0ff8c7f8b68889052672b60c5271fe2
SSDEEP

49152:KinmpIH2kaLNz+K6wQC8A2fV4VA7KgwWPBTe/mjLX/nvYX0mu:KinnH0R6K6wQCSF7fw0BC/mjLvvYO

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
2016	is-MMIH4.tmp
4824	SplitFiles127.exe
1292	rxbL4.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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	SplitFiles127.exe

Loads dropped DLL 1 IoCs

pid	Process
2016	is-MMIH4.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-7R81V.tmp	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\language\is-LD3R0.tmp	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\language\is-C1LN4.tmp	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\language\is-VO03M.tmp	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\is-06T24.tmp	is-MMIH4.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles127.exe	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\language\is-C1GNS.tmp	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\language\is-OHKKQ.tmp	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\is-9AP5C.tmp	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\is-K6PN4.tmp	is-MMIH4.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\language\is-04Q90.tmp	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\language\is-A7FRR.tmp	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\is-VKIBO.tmp	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\is-MABA8.tmp	is-MMIH4.tmp
File created	C:\Program Files (x86)\Split Files\language\is-JJ95E.tmp	is-MMIH4.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
3848	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4824	SplitFiles127.exe
4824	SplitFiles127.exe
4824	SplitFiles127.exe
4824	SplitFiles127.exe
4824	SplitFiles127.exe
4824	SplitFiles127.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3848	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1100 wrote to memory of 2016	1100	file.exe	80
PID 1100 wrote to memory of 2016	1100	file.exe	80
PID 1100 wrote to memory of 2016	1100	file.exe	80
PID 2016 wrote to memory of 4824	2016	is-MMIH4.tmp	81
PID 2016 wrote to memory of 4824	2016	is-MMIH4.tmp	81
PID 2016 wrote to memory of 4824	2016	is-MMIH4.tmp	81
PID 4824 wrote to memory of 1292	4824	SplitFiles127.exe	82
PID 4824 wrote to memory of 1292	4824	SplitFiles127.exe	82
PID 4824 wrote to memory of 1292	4824	SplitFiles127.exe	82
PID 4824 wrote to memory of 3676	4824	SplitFiles127.exe	90
PID 4824 wrote to memory of 3676	4824	SplitFiles127.exe	90
PID 4824 wrote to memory of 3676	4824	SplitFiles127.exe	90
PID 3676 wrote to memory of 3848	3676	cmd.exe	92
PID 3676 wrote to memory of 3848	3676	cmd.exe	92
PID 3676 wrote to memory of 3848	3676	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1100
- C:\Users\Admin\AppData\Local\Temp\is-42SVO.tmp\is-MMIH4.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-42SVO.tmp\is-MMIH4.tmp" /SL4 $701C4 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1735404 209408
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:2016
- - C:\Program Files (x86)\Split Files\SplitFiles127.exe
    "C:\Program Files (x86)\Split Files\SplitFiles127.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4824
  - - C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\rxbL4.exe
      4⤵
      Executes dropped EXE
      PID:1292
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles127.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles127.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3676
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles127.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:3848

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\SplitFiles127.exe

Filesize
3.3MB

MD5
b1d8dc610bdf4c823822ce7def9c371c

SHA1
9d3e4993f2f62754aa07cb4fd29e002827d52ff2

SHA256
ed891b0a0252a4b23b03192341efe56fa4d726d0ae6462f159e3d5fee81f45a1

SHA512
fc9987258afc42fe15cc2258194b0561c08291504569fe05610e3b4577e138a0730f4b31cd968805327ea46c7a4b82d37a2ef423a41c4aa887e83620c8dc1e69

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles127.exe

Filesize
3.3MB

MD5
b1d8dc610bdf4c823822ce7def9c371c

SHA1
9d3e4993f2f62754aa07cb4fd29e002827d52ff2

SHA256
ed891b0a0252a4b23b03192341efe56fa4d726d0ae6462f159e3d5fee81f45a1

SHA512
fc9987258afc42fe15cc2258194b0561c08291504569fe05610e3b4577e138a0730f4b31cd968805327ea46c7a4b82d37a2ef423a41c4aa887e83620c8dc1e69

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-42SVO.tmp\is-MMIH4.tmp

Filesize
798KB

MD5
00081e3866e7683ce75741b46d1c4606

SHA1
6652d800b30240d6d251fd65d8b44f0cf7b0bbee

SHA256
22aff95c972dce3e96efb036fd09de545601cff2de586273033cf3364ee27c4b

SHA512
97cf5be40c6b54c9f937b610a6a9e0d43c44c802913b3bbeea2bf38b3d9e112fa7302c46cf785b00d2527480b8f3e712cce1055915a1d1b908e317f9da8d6c55

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-42SVO.tmp\is-MMIH4.tmp

Filesize
798KB

MD5
00081e3866e7683ce75741b46d1c4606

SHA1
6652d800b30240d6d251fd65d8b44f0cf7b0bbee

SHA256
22aff95c972dce3e96efb036fd09de545601cff2de586273033cf3364ee27c4b

SHA512
97cf5be40c6b54c9f937b610a6a9e0d43c44c802913b3bbeea2bf38b3d9e112fa7302c46cf785b00d2527480b8f3e712cce1055915a1d1b908e317f9da8d6c55

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-97DP4.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\rxbL4.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\rxbL4.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/1100-157-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/1100-152-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/1100-132-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/1100-134-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/4824-143-0x0000000000400000-0x000000000154F000-memory.dmp

Filesize
17.3MB

Download
memory/4824-148-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/4824-153-0x0000000000400000-0x000000000154F000-memory.dmp

Filesize
17.3MB

Download
memory/4824-144-0x0000000000400000-0x000000000154F000-memory.dmp

Filesize
17.3MB

Download
memory/4824-156-0x0000000000400000-0x000000000154F000-memory.dmp

Filesize
17.3MB

Download
memory/4824-142-0x0000000000400000-0x000000000154F000-memory.dmp

Filesize
17.3MB

Download

Analysis

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