nymaim | e3a84dfbb3c7738d7cd178852094b341df4382c8dd180764f8be572b5d6bc734

Analysis

max time kernel
130s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
05/12/2022, 10:03

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General

Target
file.exe
Size 3.7MB
Sample221205-l3cfwsdb4w
SHA256 e3a84dfbb3c7738d7cd178852094b341df4382c8dd180764f8be572b5d6bc734
MD5 e7fa81fb245b3897eadc1724cf439b7b
SHA1 375b87cfeb71f8dbddcfa2169710add49501841c
SHA512 7f1e4dc3df3fe3ba4f7d3bbd22810ae9a0e6bfd036129c8dc23e4ad6501061ef2d615b22983b8d280be1131aaa8443502f90b1afc73b2a60c1fc93dc309cc218
SSDEEP 98304:w8UnghPfNuP37lWLb5Uq3WYE4BTH/wbRjcY/5:wgRfNu46q3b7TQRjcY/5
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

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
2200	is-RJT70.tmp
2164	PrintFolders.exe
3264	NZt4Sf.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
2200	is-RJT70.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\unins000.dat	is-RJT70.tmp
File created	C:\Program Files (x86)\PrintFolders\is-886GM.tmp	is-RJT70.tmp
File created	C:\Program Files (x86)\PrintFolders\is-V1AOA.tmp	is-RJT70.tmp
File created	C:\Program Files (x86)\PrintFolders\is-85CQP.tmp	is-RJT70.tmp
File created	C:\Program Files (x86)\PrintFolders\is-G3FMO.tmp	is-RJT70.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-RJT70.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-RJT70.tmp
File created	C:\Program Files (x86)\PrintFolders\is-MTVKD.tmp	is-RJT70.tmp
File created	C:\Program Files (x86)\PrintFolders\is-IU2DO.tmp	is-RJT70.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
548	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2164	PrintFolders.exe
2164	PrintFolders.exe
2164	PrintFolders.exe
2164	PrintFolders.exe
2164	PrintFolders.exe
2164	PrintFolders.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2164	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	548	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 748 wrote to memory of 2200	748	file.exe	80
PID 748 wrote to memory of 2200	748	file.exe	80
PID 748 wrote to memory of 2200	748	file.exe	80
PID 2200 wrote to memory of 2164	2200	is-RJT70.tmp	81
PID 2200 wrote to memory of 2164	2200	is-RJT70.tmp	81
PID 2200 wrote to memory of 2164	2200	is-RJT70.tmp	81
PID 2164 wrote to memory of 3264	2164	PrintFolders.exe	82
PID 2164 wrote to memory of 3264	2164	PrintFolders.exe	82
PID 2164 wrote to memory of 3264	2164	PrintFolders.exe	82
PID 2164 wrote to memory of 2568	2164	PrintFolders.exe	84
PID 2164 wrote to memory of 2568	2164	PrintFolders.exe	84
PID 2164 wrote to memory of 2568	2164	PrintFolders.exe	84
PID 2568 wrote to memory of 548	2568	cmd.exe	86
PID 2568 wrote to memory of 548	2568	cmd.exe	86
PID 2568 wrote to memory of 548	2568	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:748
- C:\Users\Admin\AppData\Local\Temp\is-ICMGV.tmp\is-RJT70.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-ICMGV.tmp\is-RJT70.tmp" /SL4 $801C4 "C:\Users\Admin\AppData\Local\Temp\file.exe" 3616853 208896
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:2200
- - C:\Program Files (x86)\PrintFolders\PrintFolders.exe
    "C:\Program Files (x86)\PrintFolders\PrintFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of WriteProcessMemory
    PID:2164
  - - C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\NZt4Sf.exe
      4⤵
      Executes dropped EXE
      PID:3264
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "PrintFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\PrintFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2568
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:548

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 6.0MB
SHA256 740617ab4f33ec6691baf8fd161402129a0f68b3ab37dc4a8b8886a13207a5e9
MD5 7617ae4ac0c2bc90e9f1e8de099f618b
SHA1 e955700e42f83de2359e33e718894c0c75db82ea
SHA512 a88204f279439d9a82503a250dcda21302658f74e39ad13ac0f4cb649d29e4788e75b0001c4e1c7c0a2e0842ee374e715c1dacebc1123244ca0f3b2c58750afc
SSDEEP 98304:XAF/jd75PniyBESF+NEIXarjgZWikj2uYhBNCYLg:XOB75FEtg5OaYU
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 6.0MB
SHA256 740617ab4f33ec6691baf8fd161402129a0f68b3ab37dc4a8b8886a13207a5e9
MD5 7617ae4ac0c2bc90e9f1e8de099f618b
SHA1 e955700e42f83de2359e33e718894c0c75db82ea
SHA512 a88204f279439d9a82503a250dcda21302658f74e39ad13ac0f4cb649d29e4788e75b0001c4e1c7c0a2e0842ee374e715c1dacebc1123244ca0f3b2c58750afc
SSDEEP 98304:XAF/jd75PniyBESF+NEIXarjgZWikj2uYhBNCYLg:XOB75FEtg5OaYU
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-A6VF0.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-RJT70.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-ICMGV.tmp\is-RJT70.tmp
Size 797KB
SHA256 4252858d9c6d8d55f829d7e418ea8357fd26fbdf8c0fce1fed23a8c720a8807e
MD5 10c841b0221d6870de7c951eaf5b1da9
SHA1 7cd2baa89144371033d8d7bebf947da886cd8795
SHA512 e2330231d6056cf8f395e1b884e136ee29161f9b9afb4492e9057aaa254c8a9b89b95be8bd11dc6d83fdc2147b864529ce49ef072015f9f40f677a0f8d12555e
SSDEEP 24576:n5NoqWolrP837JzHvA6yknyWFxvacxKcxOu:njrP837JzHvA6pnvFxv1fp
MD5 SHA1 SHA512 SSDEEP

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is-RJT70.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-ICMGV.tmp\is-RJT70.tmp
Size 797KB
SHA256 4252858d9c6d8d55f829d7e418ea8357fd26fbdf8c0fce1fed23a8c720a8807e
MD5 10c841b0221d6870de7c951eaf5b1da9
SHA1 7cd2baa89144371033d8d7bebf947da886cd8795
SHA512 e2330231d6056cf8f395e1b884e136ee29161f9b9afb4492e9057aaa254c8a9b89b95be8bd11dc6d83fdc2147b864529ce49ef072015f9f40f677a0f8d12555e
SSDEEP 24576:n5NoqWolrP837JzHvA6yknyWFxvacxKcxOu:njrP837JzHvA6pnvFxv1fp
MD5 SHA1 SHA512 SSDEEP

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NZt4Sf.exe

Path C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\NZt4Sf.exe
Size 72KB
SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
MD5 3fb36cb0b7172e5298d2992d42984d06
SHA1 439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA512 6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
SSDEEP 1536:bvUpDLxyxA14o3/M238r6+XfHAgbqmE8MpKdwuasZLUM7DsWlXcdyZgfmi:WDLZKa/MtXfHAgbqmEtxsfmyZgfmi
MD5 SHA1 SHA512 SSDEEP

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NZt4Sf.exe

Path C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\NZt4Sf.exe
Size 72KB
SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
MD5 3fb36cb0b7172e5298d2992d42984d06
SHA1 439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA512 6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
SSDEEP 1536:bvUpDLxyxA14o3/M238r6+XfHAgbqmE8MpKdwuasZLUM7DsWlXcdyZgfmi:WDLZKa/MtXfHAgbqmEtxsfmyZgfmi
MD5 SHA1 SHA512 SSDEEP

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memory/748-156-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/748-138-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/748-132-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/2164-142-0x0000000000400000-0x0000000001804000-memory.dmp

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memory/2164-144-0x0000000000400000-0x0000000001804000-memory.dmp

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memory/2164-143-0x0000000000400000-0x0000000001804000-memory.dmp

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memory/2164-148-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/2164-152-0x0000000000400000-0x0000000001804000-memory.dmp

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memory/2164-155-0x0000000000400000-0x0000000001804000-memory.dmp

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