nymaim | 77c2f269bd667b5af744fb15bd8a4e303367e787e1418757cc92f44611049a7c

General

Target

file.exe
Size

1.8MB
MD5

27046698de7a3d6e5f5857108b4093a7
SHA1

d3bb9760a390101f4ca5d445e357b357deb84b64
SHA256

77c2f269bd667b5af744fb15bd8a4e303367e787e1418757cc92f44611049a7c
SHA512

f2b91623b692cb38b8f6769c3ef7044ad67658e37f91c076967f5442d80c3aa4367b7beef7d8cec16f1f2a92c0b1a33b3a69625f4a477a007eec3fb6e35df9ca
SSDEEP

49152:Ii/tvjCyUs6Hx5U/hRkqnDcdISuv21eo9IbKuKmRvLpFR+DI21MSBk3u:Ii/tvj8se1Cwugb9KKuKmRDpb+UHSBke

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
4172	is-AQL4I.tmp
2676	SplitFiles128.exe
1692	n1fjsJL4zFu.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	SplitFiles128.exe

Loads dropped DLL 1 IoCs

pid	Process
4172	is-AQL4I.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-7H4LI.tmp	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\is-V21UA.tmp	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\is-B6HS5.tmp	is-AQL4I.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\language\is-EK0FC.tmp	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\language\is-ER64R.tmp	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\language\is-3JLOE.tmp	is-AQL4I.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles128.exe	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\language\is-D5C3L.tmp	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\language\is-RTGP1.tmp	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\language\is-3HVEF.tmp	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\is-622O8.tmp	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\is-77O3O.tmp	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\is-P95DO.tmp	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\language\is-B3DA1.tmp	is-AQL4I.tmp
File created	C:\Program Files (x86)\Split Files\language\is-BBIH5.tmp	is-AQL4I.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
2364	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2676	SplitFiles128.exe
2676	SplitFiles128.exe
2676	SplitFiles128.exe
2676	SplitFiles128.exe
2676	SplitFiles128.exe
2676	SplitFiles128.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2364	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4328 wrote to memory of 4172	4328	file.exe	82
PID 4328 wrote to memory of 4172	4328	file.exe	82
PID 4328 wrote to memory of 4172	4328	file.exe	82
PID 4172 wrote to memory of 2676	4172	is-AQL4I.tmp	83
PID 4172 wrote to memory of 2676	4172	is-AQL4I.tmp	83
PID 4172 wrote to memory of 2676	4172	is-AQL4I.tmp	83
PID 2676 wrote to memory of 1692	2676	SplitFiles128.exe	84
PID 2676 wrote to memory of 1692	2676	SplitFiles128.exe	84
PID 2676 wrote to memory of 1692	2676	SplitFiles128.exe	84
PID 2676 wrote to memory of 4504	2676	SplitFiles128.exe	92
PID 2676 wrote to memory of 4504	2676	SplitFiles128.exe	92
PID 2676 wrote to memory of 4504	2676	SplitFiles128.exe	92
PID 4504 wrote to memory of 2364	4504	cmd.exe	94
PID 4504 wrote to memory of 2364	4504	cmd.exe	94
PID 4504 wrote to memory of 2364	4504	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4328
- C:\Users\Admin\AppData\Local\Temp\is-DDOME.tmp\is-AQL4I.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-DDOME.tmp\is-AQL4I.tmp" /SL4 $C01E4 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1597539 93184
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4172
- - C:\Program Files (x86)\Split Files\SplitFiles128.exe
    "C:\Program Files (x86)\Split Files\SplitFiles128.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:2676
  - - C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\n1fjsJL4zFu.exe
      4⤵
      Executes dropped EXE
      PID:1692
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles128.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles128.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4504
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles128.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2364

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\SplitFiles128.exe

Filesize
3.3MB

MD5
a68811083e82c7d58cccb9c431e475a6

SHA1
a48df7a8e2b7e6f3060cd5ba604f2214971ff216

SHA256
c631d87e6fa9bae8bad7a8375e7139cfa066d2c302dbcd6de3dbade263ea8334

SHA512
5adf29e6e89df27e7e5b8743744175165ca36223050063967d711746e923206e620d08eb17637255661d7227a541420cae9620109c2c98b5f80d3b9198ec18f9

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles128.exe

Filesize
3.3MB

MD5
a68811083e82c7d58cccb9c431e475a6

SHA1
a48df7a8e2b7e6f3060cd5ba604f2214971ff216

SHA256
c631d87e6fa9bae8bad7a8375e7139cfa066d2c302dbcd6de3dbade263ea8334

SHA512
5adf29e6e89df27e7e5b8743744175165ca36223050063967d711746e923206e620d08eb17637255661d7227a541420cae9620109c2c98b5f80d3b9198ec18f9

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-DDOME.tmp\is-AQL4I.tmp

Filesize
685KB

MD5
7f46188bafe719b5ba8e32c2e0037f21

SHA1
6dc19d768f6b24766cfcdf49f630b517174c780e

SHA256
3c65b17529d5a22bbcb9f726f567f3a0506f6536bc5048789fd2f11c420ffd5e

SHA512
5c14cf51850c1e02765e86f7a166e7554425c3399e979ff75397a1c430e1c5099545eddd51e65b06790fb3cc9cbb70b70749438ec3277deba5a0eb4c3beb2bc3

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-DDOME.tmp\is-AQL4I.tmp

Filesize
685KB

MD5
7f46188bafe719b5ba8e32c2e0037f21

SHA1
6dc19d768f6b24766cfcdf49f630b517174c780e

SHA256
3c65b17529d5a22bbcb9f726f567f3a0506f6536bc5048789fd2f11c420ffd5e

SHA512
5c14cf51850c1e02765e86f7a166e7554425c3399e979ff75397a1c430e1c5099545eddd51e65b06790fb3cc9cbb70b70749438ec3277deba5a0eb4c3beb2bc3

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-LTH8K.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}\n1fjsJL4zFu.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\n1fjsJL4zFu.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/2676-148-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/2676-143-0x0000000000400000-0x0000000001552000-memory.dmp

Filesize
17.3MB

Download
memory/2676-144-0x0000000000400000-0x0000000001552000-memory.dmp

Filesize
17.3MB

Download
memory/2676-141-0x0000000000400000-0x0000000001552000-memory.dmp

Filesize
17.3MB

Download
memory/2676-152-0x0000000000400000-0x0000000001552000-memory.dmp

Filesize
17.3MB

Download
memory/2676-155-0x0000000000400000-0x0000000001552000-memory.dmp

Filesize
17.3MB

Download
memory/4328-138-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download
memory/4328-132-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download
memory/4328-156-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download

Analysis

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