nymaim | 4911330ebb6477a1c55e87658de922bbc12cadcf8769db69f665f63d6417bbb5

General

Target

file.exe
Size

2.3MB
MD5

ec616833bf4cb2a01f40730cef04efcd
SHA1

ebca2be25153ef2696fe0037d47219c9c593eddb
SHA256

4911330ebb6477a1c55e87658de922bbc12cadcf8769db69f665f63d6417bbb5
SHA512

72fc2bf15088e731a09c6cd4c71cafc688a644aa598ed8cf27609487d5d46b9076ab5d8590da1d3d473bba4ca783ef37e9546e99e964b1746282f817fd3fac04
SSDEEP

49152:5fCBx0egW+k4/odRfroT9D7syVb8LsSLOVbBDivLlAz:56l+kC4Rfrs9CASkhz

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
1584	is-OA8F0.tmp
664	obFolders.exe
4240	sXhHEVNwuvZ.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	obFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
1584	is-OA8F0.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 9 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\PrintFolders\is-BS2RI.tmp	is-OA8F0.tmp
File created	C:\Program Files (x86)\PrintFolders\is-8OLNA.tmp	is-OA8F0.tmp
File created	C:\Program Files (x86)\PrintFolders\is-SM609.tmp	is-OA8F0.tmp
File created	C:\Program Files (x86)\PrintFolders\is-RG9CJ.tmp	is-OA8F0.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-OA8F0.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-OA8F0.tmp
File created	C:\Program Files (x86)\PrintFolders\is-5OP49.tmp	is-OA8F0.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\obFolders.exe	is-OA8F0.tmp
File created	C:\Program Files (x86)\PrintFolders\is-J68E9.tmp	is-OA8F0.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
1400	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
664	obFolders.exe
664	obFolders.exe
664	obFolders.exe
664	obFolders.exe
664	obFolders.exe
664	obFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1400	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1612 wrote to memory of 1584	1612	file.exe	82
PID 1612 wrote to memory of 1584	1612	file.exe	82
PID 1612 wrote to memory of 1584	1612	file.exe	82
PID 1584 wrote to memory of 664	1584	is-OA8F0.tmp	83
PID 1584 wrote to memory of 664	1584	is-OA8F0.tmp	83
PID 1584 wrote to memory of 664	1584	is-OA8F0.tmp	83
PID 664 wrote to memory of 4240	664	obFolders.exe	84
PID 664 wrote to memory of 4240	664	obFolders.exe	84
PID 664 wrote to memory of 4240	664	obFolders.exe	84
PID 664 wrote to memory of 4496	664	obFolders.exe	92
PID 664 wrote to memory of 4496	664	obFolders.exe	92
PID 664 wrote to memory of 4496	664	obFolders.exe	92
PID 4496 wrote to memory of 1400	4496	cmd.exe	94
PID 4496 wrote to memory of 1400	4496	cmd.exe	94
PID 4496 wrote to memory of 1400	4496	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:1612
- C:\Users\Admin\AppData\Local\Temp\is-UA29S.tmp\is-OA8F0.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-UA29S.tmp\is-OA8F0.tmp" /SL4 $D01EE "C:\Users\Admin\AppData\Local\Temp\file.exe" 2152622 169472
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:1584
- - C:\Program Files (x86)\PrintFolders\obFolders.exe
    "C:\Program Files (x86)\PrintFolders\obFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:664
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\sXhHEVNwuvZ.exe
      4⤵
      Executes dropped EXE
      PID:4240
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "obFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\obFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4496
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "obFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1400

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)\PrintFolders\obFolders.exe

Filesize
3.5MB

MD5
519304298fd32ccbff7c78fe7c7c61a9

SHA1
10297f328165563fff5f8e4eb4685232e71778cb

SHA256
3592f01903837377542c07373ed7b4c517bbec3817bfbb007b63202cce7c1236

SHA512
3935080afd29ccee2aa6728aa06b2e19d9062c297329566e35402b4f7210b353ded56090bbf50cfec444d8750257f6e7f3b6c97929739a06229715a6cc295f20

Download Submit
C:\Program Files (x86)\PrintFolders\obFolders.exe

Filesize
3.5MB

MD5
519304298fd32ccbff7c78fe7c7c61a9

SHA1
10297f328165563fff5f8e4eb4685232e71778cb

SHA256
3592f01903837377542c07373ed7b4c517bbec3817bfbb007b63202cce7c1236

SHA512
3935080afd29ccee2aa6728aa06b2e19d9062c297329566e35402b4f7210b353ded56090bbf50cfec444d8750257f6e7f3b6c97929739a06229715a6cc295f20

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-56B3L.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-UA29S.tmp\is-OA8F0.tmp

Filesize
759KB

MD5
0dc8826072fc99382be7db6ae5929aff

SHA1
7ca23e146bf9bde712b27e400de3243e6bd0a357

SHA256
11ec35b1fea3160e892f0875034a2f18cf0d8d8874ac611b5a7e0f0ace2667ec

SHA512
08db35c065b9b8f740242587f35a3c0ba772993d8132589fe26bafa9bab31d6c5aecae62490a22e135d64ce6b54c26e553534e5d9d6e01d6be8472f471bdf442

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-UA29S.tmp\is-OA8F0.tmp

Filesize
759KB

MD5
0dc8826072fc99382be7db6ae5929aff

SHA1
7ca23e146bf9bde712b27e400de3243e6bd0a357

SHA256
11ec35b1fea3160e892f0875034a2f18cf0d8d8874ac611b5a7e0f0ace2667ec

SHA512
08db35c065b9b8f740242587f35a3c0ba772993d8132589fe26bafa9bab31d6c5aecae62490a22e135d64ce6b54c26e553534e5d9d6e01d6be8472f471bdf442

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

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

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

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/664-143-0x0000000000400000-0x000000000158A000-memory.dmp

Filesize
17.5MB

Download
memory/664-148-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/664-142-0x0000000000400000-0x000000000158A000-memory.dmp

Filesize
17.5MB

Download
memory/664-155-0x0000000000400000-0x000000000158A000-memory.dmp

Filesize
17.5MB

Download
memory/664-144-0x0000000000400000-0x000000000158A000-memory.dmp

Filesize
17.5MB

Download
memory/664-152-0x0000000000400000-0x000000000158A000-memory.dmp

Filesize
17.5MB

Download
memory/1612-137-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1612-132-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1612-156-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download

Analysis

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