nymaim | d1ea0f513209f534c4c0010ec9e36209b442ea737553d8175e3170d7662ed2cf

Analysis

max time kernel
100s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
07/12/2022, 12:02

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General

Target
file.exe
Size 2.2MB
Sample221207-n7g82shf21
SHA256 d1ea0f513209f534c4c0010ec9e36209b442ea737553d8175e3170d7662ed2cf
MD5 ddc564b7ea829c508907d32517e75452
SHA1 20d49fcdd43893e7856798f535c95b37c4ec20ea
SHA512 1ad5ba371fd2049b6fc1a6e205b590ad94a6a72da042dc9191d1f7484808e6885a06b754c96504db9e008530f347dc0f81aaf6f0bd41101602ebf1a128d278e9
SSDEEP 49152:WXwNqdqK5HtmmX6ct79pfKIrEyaFc7M1eJe6RjPSzs2bTTUggAjuZwN41kX:WAqdqK9tbt79pFFW6ZOTQXk
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
5004	is-PT338.tmp
1480	RintFolders.exe
4056	4OnN6cEp6i.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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	RintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
5004	is-PT338.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-4IFG6.tmp	is-PT338.tmp
File created	C:\Program Files (x86)\PrintFolders\is-D8FTS.tmp	is-PT338.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-PT338.tmp
File created	C:\Program Files (x86)\PrintFolders\is-1J3AG.tmp	is-PT338.tmp
File created	C:\Program Files (x86)\PrintFolders\is-LC5QC.tmp	is-PT338.tmp
File created	C:\Program Files (x86)\PrintFolders\is-7LBQ3.tmp	is-PT338.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-PT338.tmp
File created	C:\Program Files (x86)\PrintFolders\is-A2BA4.tmp	is-PT338.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\RintFolders.exe	is-PT338.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
1236	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1480	RintFolders.exe
1480	RintFolders.exe
1480	RintFolders.exe
1480	RintFolders.exe
1480	RintFolders.exe
1480	RintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1236	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4912 wrote to memory of 5004	4912	file.exe	82
PID 4912 wrote to memory of 5004	4912	file.exe	82
PID 4912 wrote to memory of 5004	4912	file.exe	82
PID 5004 wrote to memory of 1480	5004	is-PT338.tmp	83
PID 5004 wrote to memory of 1480	5004	is-PT338.tmp	83
PID 5004 wrote to memory of 1480	5004	is-PT338.tmp	83
PID 1480 wrote to memory of 4056	1480	RintFolders.exe	84
PID 1480 wrote to memory of 4056	1480	RintFolders.exe	84
PID 1480 wrote to memory of 4056	1480	RintFolders.exe	84
PID 1480 wrote to memory of 392	1480	RintFolders.exe	90
PID 1480 wrote to memory of 392	1480	RintFolders.exe	90
PID 1480 wrote to memory of 392	1480	RintFolders.exe	90
PID 392 wrote to memory of 1236	392	cmd.exe	93
PID 392 wrote to memory of 1236	392	cmd.exe	93
PID 392 wrote to memory of 1236	392	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4912
- C:\Users\Admin\AppData\Local\Temp\is-6OSR8.tmp\is-PT338.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-6OSR8.tmp\is-PT338.tmp" /SL4 $D0042 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2068725 73728
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:5004
- - C:\Program Files (x86)\PrintFolders\RintFolders.exe
    "C:\Program Files (x86)\PrintFolders\RintFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:1480
  - - C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\4OnN6cEp6i.exe
      4⤵
      Executes dropped EXE
      PID:4056
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "RintFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\RintFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:392
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "RintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1236

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

RintFolders.exe

Path C:\Program Files (x86)\PrintFolders\RintFolders.exe
Size 3.3MB
SHA256 c941ae5875f3c15287863bb891ffbdb3a4eed37ea6cf524db581afa45fe22ceb
MD5 03252051ba092a58be06a786c92b8110
SHA1 dbb17879f578cd7a17bbf74d1c6e0429fbc7ccdf
SHA512 7df02ab128b474528ab0f2ed6e38e27115b8b95f4e7038f0622fea27a4c9ad99428c1667a50a11772a945857d8c2a115468dbaa4ac6f7899849556f1d4696cf2
SSDEEP 98304:4dJLaJ0qa3LwqFfmidJ3Qj8o0UI9gFEeNcF:vrzK
MD5 SHA1 SHA512 SSDEEP

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RintFolders.exe

Path C:\Program Files (x86)\PrintFolders\RintFolders.exe
Size 3.3MB
SHA256 c941ae5875f3c15287863bb891ffbdb3a4eed37ea6cf524db581afa45fe22ceb
MD5 03252051ba092a58be06a786c92b8110
SHA1 dbb17879f578cd7a17bbf74d1c6e0429fbc7ccdf
SHA512 7df02ab128b474528ab0f2ed6e38e27115b8b95f4e7038f0622fea27a4c9ad99428c1667a50a11772a945857d8c2a115468dbaa4ac6f7899849556f1d4696cf2
SSDEEP 98304:4dJLaJ0qa3LwqFfmidJ3Qj8o0UI9gFEeNcF:vrzK
MD5 SHA1 SHA512 SSDEEP

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is-PT338.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-6OSR8.tmp\is-PT338.tmp
Size 665KB
SHA256 2a841ad3820292ff2ab96429635062d0984d0b221e8bd7650777a1c51043b722
MD5 21efb90aabcda42c1232f008bd66fd99
SHA1 563835721536bbd8310eb1dc2fa18966ddffff3d
SHA512 106432d5d58bd2f904cbb9f28771c7b95ccbdd7cdf506b190f5968dbf552ae4ed54cd2f46624ab47cc730c565b7d8d7de7cc51609540df05d0a46c932c20c36e
SSDEEP 12288:/h5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvX4xO6:p5NoqWolrP837JzHvA6yknyWFxvoxO6
MD5 SHA1 SHA512 SSDEEP

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is-PT338.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-6OSR8.tmp\is-PT338.tmp
Size 665KB
SHA256 2a841ad3820292ff2ab96429635062d0984d0b221e8bd7650777a1c51043b722
MD5 21efb90aabcda42c1232f008bd66fd99
SHA1 563835721536bbd8310eb1dc2fa18966ddffff3d
SHA512 106432d5d58bd2f904cbb9f28771c7b95ccbdd7cdf506b190f5968dbf552ae4ed54cd2f46624ab47cc730c565b7d8d7de7cc51609540df05d0a46c932c20c36e
SSDEEP 12288:/h5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvX4xO6:p5NoqWolrP837JzHvA6yknyWFxvoxO6
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-9UK4O.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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4OnN6cEp6i.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\4OnN6cEp6i.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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4OnN6cEp6i.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\4OnN6cEp6i.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/1480-143-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/1480-144-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/1480-142-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/1480-148-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/1480-152-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/1480-155-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/4912-132-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4912-134-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4912-156-0x0000000000400000-0x0000000000418000-memory.dmp

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