nymaim | 9634f77490055d634e82063482252c5fc761b17322376df5f6d52b58f0845170

General

Target

file.exe
Size

1.9MB
MD5

3fba31af841b8ed5c9e3d1b78a832657
SHA1

43633c641cf896b016ef23ed5c5c59420ea2d691
SHA256

9634f77490055d634e82063482252c5fc761b17322376df5f6d52b58f0845170
SHA512

91d256704e7da13f4724baf8387f86b250c1863ed2f0937b474495c0f20759e373ba2bb4d25ddefcfb4935387222a9325ea96f027096ed3c82fef955fe892f95
SSDEEP

49152:0i/MZEP8AUToXCLDVAOzfylUMozV4DlKKw21zq8TNp/:0ikGjSPVAOzSeVC9wUzq87

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
2448	is-0Q6J5.tmp
4872	PlitFiles132.exe
2716	Oi3krhnSok.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	PlitFiles132.exe

Loads dropped DLL 1 IoCs

pid	Process
2448	is-0Q6J5.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-IGA8O.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\is-0NHB5.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\is-OH5PV.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\language\is-0917B.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\language\is-E6UFL.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\language\is-LJUNO.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\is-RGFO7.tmp	is-0Q6J5.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\is-UB2NE.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\language\is-EGKEV.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\language\is-5E7LB.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\language\is-TJDEG.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\language\is-JV27G.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\is-T5R45.tmp	is-0Q6J5.tmp
File created	C:\Program Files (x86)\Split Files\language\is-VB8SM.tmp	is-0Q6J5.tmp
File opened for modification	C:\Program Files (x86)\Split Files\PlitFiles132.exe	is-0Q6J5.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
1352	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4872	PlitFiles132.exe
4872	PlitFiles132.exe
4872	PlitFiles132.exe
4872	PlitFiles132.exe
4872	PlitFiles132.exe
4872	PlitFiles132.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1352	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1608 wrote to memory of 2448	1608	file.exe	80
PID 1608 wrote to memory of 2448	1608	file.exe	80
PID 1608 wrote to memory of 2448	1608	file.exe	80
PID 2448 wrote to memory of 4872	2448	is-0Q6J5.tmp	81
PID 2448 wrote to memory of 4872	2448	is-0Q6J5.tmp	81
PID 2448 wrote to memory of 4872	2448	is-0Q6J5.tmp	81
PID 4872 wrote to memory of 2716	4872	PlitFiles132.exe	84
PID 4872 wrote to memory of 2716	4872	PlitFiles132.exe	84
PID 4872 wrote to memory of 2716	4872	PlitFiles132.exe	84
PID 4872 wrote to memory of 4164	4872	PlitFiles132.exe	90
PID 4872 wrote to memory of 4164	4872	PlitFiles132.exe	90
PID 4872 wrote to memory of 4164	4872	PlitFiles132.exe	90
PID 4164 wrote to memory of 1352	4164	cmd.exe	92
PID 4164 wrote to memory of 1352	4164	cmd.exe	92
PID 4164 wrote to memory of 1352	4164	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:1608
- C:\Users\Admin\AppData\Local\Temp\is-7E0GG.tmp\is-0Q6J5.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-7E0GG.tmp\is-0Q6J5.tmp" /SL4 $8004A "C:\Users\Admin\AppData\Local\Temp\file.exe" 1734466 96768
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:2448
- - C:\Program Files (x86)\Split Files\PlitFiles132.exe
    "C:\Program Files (x86)\Split Files\PlitFiles132.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4872
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\Oi3krhnSok.exe
      4⤵
      Executes dropped EXE
      PID:2716
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "PlitFiles132.exe" /f & erase "C:\Program Files (x86)\Split Files\PlitFiles132.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4164
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PlitFiles132.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1352

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\PlitFiles132.exe

Filesize
3.3MB

MD5
23e8c6e608fd2ffe1801ccafd3d84fb4

SHA1
673393adfd84a5ef73bfd6c00839a499b5850e0b

SHA256
b8de2950c4ea67bbb2e1570058ab552cf29144ed94f54443717225fdff24a048

SHA512
d85c3e6f0e88c08959a6f7be2a565a7a7a615f4087630c9b9946686d526f483769436bcefa00ce625190ab04785c69e04c78e9c8464f33dd1ee41a2a4b55e87d

Download Submit
C:\Program Files (x86)\Split Files\PlitFiles132.exe

Filesize
3.3MB

MD5
23e8c6e608fd2ffe1801ccafd3d84fb4

SHA1
673393adfd84a5ef73bfd6c00839a499b5850e0b

SHA256
b8de2950c4ea67bbb2e1570058ab552cf29144ed94f54443717225fdff24a048

SHA512
d85c3e6f0e88c08959a6f7be2a565a7a7a615f4087630c9b9946686d526f483769436bcefa00ce625190ab04785c69e04c78e9c8464f33dd1ee41a2a4b55e87d

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-7E0GG.tmp\is-0Q6J5.tmp

Filesize
688KB

MD5
825e351a0f8f4c0765f2362966ac3122

SHA1
b7776ed8bd5cb15d6f6a12805de3394012b3f8c1

SHA256
d55e786215fe7ec096087dbf7a3558397768ad50f0182f474d2a3ce6ed772405

SHA512
775613f17bdfa13bfb99660f517d7b1fdd31acc268304a184fc86cc339c987e2d020c313a685c22fb406422137ffc4c999b7988951ade37c2990b898b0fb9f43

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-7E0GG.tmp\is-0Q6J5.tmp

Filesize
688KB

MD5
825e351a0f8f4c0765f2362966ac3122

SHA1
b7776ed8bd5cb15d6f6a12805de3394012b3f8c1

SHA256
d55e786215fe7ec096087dbf7a3558397768ad50f0182f474d2a3ce6ed772405

SHA512
775613f17bdfa13bfb99660f517d7b1fdd31acc268304a184fc86cc339c987e2d020c313a685c22fb406422137ffc4c999b7988951ade37c2990b898b0fb9f43

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-TGHE3.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\Oi3krhnSok.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\Oi3krhnSok.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/1608-155-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/1608-132-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/1608-138-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4872-143-0x0000000000400000-0x0000000001546000-memory.dmp

Filesize
17.3MB

Download
memory/4872-151-0x0000000000400000-0x0000000001546000-memory.dmp

Filesize
17.3MB

Download
memory/4872-147-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/4872-142-0x0000000000400000-0x0000000001546000-memory.dmp

Filesize
17.3MB

Download
memory/4872-154-0x0000000000400000-0x0000000001546000-memory.dmp

Filesize
17.3MB

Download

Analysis

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