nymaim | 7ba465c8e919d7b74630f437ea46f3cd1acb2b6ef559fa12597014153704756f

Analysis

max time kernel
91s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
07/12/2022, 18:16

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General

Target
file.exe
Size 2.2MB
Sample221207-wwfvvafe97
SHA256 7ba465c8e919d7b74630f437ea46f3cd1acb2b6ef559fa12597014153704756f
MD5 0debc4647ba1b85afbe1c7194a45c218
SHA1 ca29138d903786adea5505091491b99d1546a92b
SHA512 2d7aa552448e64e8ebabb4731e7bcdbcaf12b248a7c960debaf3f14d8020cb211ac0c21de2bed99455461d155272b26dc70aebeb3d0e4075f13b294ffb60814d
SSDEEP 49152:O+fbV3xulwChfo0W4JePWgxMuYyYQn2BScztrZwN41kK:O+fbV3AlPWdY3goQtcJ1
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
2260	is-ST2VG.tmp
5020	RintFolders.exe
632	YJ4RPl1.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	RintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
2260	is-ST2VG.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-A1JM4.tmp	is-ST2VG.tmp
File created	C:\Program Files (x86)\PrintFolders\is-5V08K.tmp	is-ST2VG.tmp
File created	C:\Program Files (x86)\PrintFolders\is-NP2UP.tmp	is-ST2VG.tmp
File created	C:\Program Files (x86)\PrintFolders\is-GLPSP.tmp	is-ST2VG.tmp
File created	C:\Program Files (x86)\PrintFolders\is-J9T73.tmp	is-ST2VG.tmp
File created	C:\Program Files (x86)\PrintFolders\is-818VS.tmp	is-ST2VG.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-ST2VG.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-ST2VG.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\RintFolders.exe	is-ST2VG.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
1052	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
5020	RintFolders.exe
5020	RintFolders.exe
5020	RintFolders.exe
5020	RintFolders.exe
5020	RintFolders.exe
5020	RintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1052	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4964 wrote to memory of 2260	4964	file.exe	81
PID 4964 wrote to memory of 2260	4964	file.exe	81
PID 4964 wrote to memory of 2260	4964	file.exe	81
PID 2260 wrote to memory of 5020	2260	is-ST2VG.tmp	82
PID 2260 wrote to memory of 5020	2260	is-ST2VG.tmp	82
PID 2260 wrote to memory of 5020	2260	is-ST2VG.tmp	82
PID 5020 wrote to memory of 632	5020	RintFolders.exe	83
PID 5020 wrote to memory of 632	5020	RintFolders.exe	83
PID 5020 wrote to memory of 632	5020	RintFolders.exe	83
PID 5020 wrote to memory of 1568	5020	RintFolders.exe	91
PID 5020 wrote to memory of 1568	5020	RintFolders.exe	91
PID 5020 wrote to memory of 1568	5020	RintFolders.exe	91
PID 1568 wrote to memory of 1052	1568	cmd.exe	93
PID 1568 wrote to memory of 1052	1568	cmd.exe	93
PID 1568 wrote to memory of 1052	1568	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:4964
- C:\Users\Admin\AppData\Local\Temp\is-6GSA0.tmp\is-ST2VG.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-6GSA0.tmp\is-ST2VG.tmp" /SL4 $70034 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2068761 73728
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:2260
- - 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:5020
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\YJ4RPl1.exe
      4⤵
      Executes dropped EXE
      PID:632
  - - 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:1568
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "RintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1052

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 8e587ed6ac7672711d16f55289b3ff34eb5d3dfbeba1e25f4281a85afa6466dc
MD5 094b25d7fcbffe3c481af7cedac6d19f
SHA1 b498f5bab49cad73bdb6b55c5879d891b4df8643
SHA512 b566d69489b7099409836d9c3c58a8d41464e7c9050ab6b1ca0ec8bce3eaf5fdc2ac2c8328751c983d83394ed3d4c4c34ab1e50513ff49a8c19c836a560904bc
SSDEEP 98304:ve+3Sqp4DG1oDZrghXaoHtdGluAEH9gN152KzMgY:KrOcEH8MgY
MD5 SHA1 SHA512 SSDEEP

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RintFolders.exe

Path C:\Program Files (x86)\PrintFolders\RintFolders.exe
Size 3.3MB
SHA256 8e587ed6ac7672711d16f55289b3ff34eb5d3dfbeba1e25f4281a85afa6466dc
MD5 094b25d7fcbffe3c481af7cedac6d19f
SHA1 b498f5bab49cad73bdb6b55c5879d891b4df8643
SHA512 b566d69489b7099409836d9c3c58a8d41464e7c9050ab6b1ca0ec8bce3eaf5fdc2ac2c8328751c983d83394ed3d4c4c34ab1e50513ff49a8c19c836a560904bc
SSDEEP 98304:ve+3Sqp4DG1oDZrghXaoHtdGluAEH9gN152KzMgY:KrOcEH8MgY
MD5 SHA1 SHA512 SSDEEP

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is-ST2VG.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-6GSA0.tmp\is-ST2VG.tmp
Size 665KB
SHA256 2a841ad3820292ff2ab96429635062d0984d0b221e8bd7650777a1c51043b722
MD5 21efb90aabcda42c1232f008bd66fd99
SHA1 563835721536bbd8310eb1dc2fa18966ddffff3d
SHA512 106432d5d58bd2f904cbb9f28771c7b95ccbdd7cdf506b190f5968dbf552ae4ed54cd2f46624ab47cc730c565b7d8d7de7cc51609540df05d0a46c932c20c36e
SSDEEP 12288:/h5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvX4xO6:p5NoqWolrP837JzHvA6yknyWFxvoxO6
MD5 SHA1 SHA512 SSDEEP

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is-ST2VG.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-6GSA0.tmp\is-ST2VG.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-DD53Q.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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YJ4RPl1.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\YJ4RPl1.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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YJ4RPl1.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\YJ4RPl1.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/4964-132-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4964-155-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4964-137-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/5020-143-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/5020-151-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/5020-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/5020-142-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/5020-154-0x0000000000400000-0x000000000154A000-memory.dmp

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