nymaim | 6bfc463f800c95aa5e4427869134b338a914e4caaccd171bef86385befbaa645

Analysis

max time kernel
90s
max time network
127s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
08/12/2022, 00:46

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General

Target
file.exe
Size 2.4MB
Sample221208-a4m38sbf21
SHA256 6bfc463f800c95aa5e4427869134b338a914e4caaccd171bef86385befbaa645
MD5 14c7dad790c8b180d56058c0c219f217
SHA1 317b7765ceeee0425866c5c5f8665e2640ad069d
SHA512 e12cb358104e5c73e41956ad26884f8fe271a4c029d8e63a1dd0992c8c925ccfe0a5bb1067b3d1b0e8103f262c757b02f6521780257ab33306409153cf5e363e
SSDEEP 49152:ib28ze1RBZfVoILoAeN+ZLoJWSxzeZwN41kV:iFq1RB9VVoAeN+haHCq
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
3120	is-RAU2O.tmp
1152	RintFolders.exe
4728	i1szC.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
3120	is-RAU2O.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-4Q2C1.tmp	is-RAU2O.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-RAU2O.tmp
File created	C:\Program Files (x86)\PrintFolders\is-8RD4K.tmp	is-RAU2O.tmp
File created	C:\Program Files (x86)\PrintFolders\is-IUS9S.tmp	is-RAU2O.tmp
File created	C:\Program Files (x86)\PrintFolders\is-QIEN8.tmp	is-RAU2O.tmp
File created	C:\Program Files (x86)\PrintFolders\is-NQJQG.tmp	is-RAU2O.tmp
File created	C:\Program Files (x86)\PrintFolders\is-BB2BV.tmp	is-RAU2O.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-RAU2O.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\RintFolders.exe	is-RAU2O.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
3456	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1152	RintFolders.exe
1152	RintFolders.exe
1152	RintFolders.exe
1152	RintFolders.exe
1152	RintFolders.exe
1152	RintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3456	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4252 wrote to memory of 3120	4252	file.exe	81
PID 4252 wrote to memory of 3120	4252	file.exe	81
PID 4252 wrote to memory of 3120	4252	file.exe	81
PID 3120 wrote to memory of 1152	3120	is-RAU2O.tmp	82
PID 3120 wrote to memory of 1152	3120	is-RAU2O.tmp	82
PID 3120 wrote to memory of 1152	3120	is-RAU2O.tmp	82
PID 1152 wrote to memory of 4728	1152	RintFolders.exe	83
PID 1152 wrote to memory of 4728	1152	RintFolders.exe	83
PID 1152 wrote to memory of 4728	1152	RintFolders.exe	83
PID 1152 wrote to memory of 3224	1152	RintFolders.exe	92
PID 1152 wrote to memory of 3224	1152	RintFolders.exe	92
PID 1152 wrote to memory of 3224	1152	RintFolders.exe	92
PID 3224 wrote to memory of 3456	3224	cmd.exe	94
PID 3224 wrote to memory of 3456	3224	cmd.exe	94
PID 3224 wrote to memory of 3456	3224	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:4252
- C:\Users\Admin\AppData\Local\Temp\is-Q45TD.tmp\is-RAU2O.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-Q45TD.tmp\is-RAU2O.tmp" /SL4 $D002E "C:\Users\Admin\AppData\Local\Temp\file.exe" 2244975 73728
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:3120
- - 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:1152
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\i1szC.exe
      4⤵
      Executes dropped EXE
      PID:4728
  - - 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:3224
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "RintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:3456

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 3.5MB
SHA256 455f3eb2cb99108a0c5b53af848fb5d9a2c5e1f8b2e6ec909b8a045c9d93b8d2
MD5 1463e2db48a7986b582c8799e7a6e518
SHA1 39cd2a08c28abb379445b0143117eb2306e10bc4
SHA512 690ca6ea83c7a1e20ca5fa53afdb428a72b162406e9cbe5e3c2efa31f96a303b0005c035084b2f6a77ef838f69372a76445dc7574e2fe625c1c2a9282ae47192
SSDEEP 98304:0PZ8JU/DI2lbggce+k8AuZQfviDtvvGgz:kOhPz
MD5 SHA1 SHA512 SSDEEP

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RintFolders.exe

Path C:\Program Files (x86)\PrintFolders\RintFolders.exe
Size 3.5MB
SHA256 455f3eb2cb99108a0c5b53af848fb5d9a2c5e1f8b2e6ec909b8a045c9d93b8d2
MD5 1463e2db48a7986b582c8799e7a6e518
SHA1 39cd2a08c28abb379445b0143117eb2306e10bc4
SHA512 690ca6ea83c7a1e20ca5fa53afdb428a72b162406e9cbe5e3c2efa31f96a303b0005c035084b2f6a77ef838f69372a76445dc7574e2fe625c1c2a9282ae47192
SSDEEP 98304:0PZ8JU/DI2lbggce+k8AuZQfviDtvvGgz:kOhPz
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

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

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is-RAU2O.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-Q45TD.tmp\is-RAU2O.tmp
Size 665KB
SHA256 2a841ad3820292ff2ab96429635062d0984d0b221e8bd7650777a1c51043b722
MD5 21efb90aabcda42c1232f008bd66fd99
SHA1 563835721536bbd8310eb1dc2fa18966ddffff3d
SHA512 106432d5d58bd2f904cbb9f28771c7b95ccbdd7cdf506b190f5968dbf552ae4ed54cd2f46624ab47cc730c565b7d8d7de7cc51609540df05d0a46c932c20c36e
SSDEEP 12288:/h5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvX4xO6:p5NoqWolrP837JzHvA6yknyWFxvoxO6
MD5 SHA1 SHA512 SSDEEP

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is-RAU2O.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-Q45TD.tmp\is-RAU2O.tmp
Size 665KB
SHA256 2a841ad3820292ff2ab96429635062d0984d0b221e8bd7650777a1c51043b722
MD5 21efb90aabcda42c1232f008bd66fd99
SHA1 563835721536bbd8310eb1dc2fa18966ddffff3d
SHA512 106432d5d58bd2f904cbb9f28771c7b95ccbdd7cdf506b190f5968dbf552ae4ed54cd2f46624ab47cc730c565b7d8d7de7cc51609540df05d0a46c932c20c36e
SSDEEP 12288:/h5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvX4xO6:p5NoqWolrP837JzHvA6yknyWFxvoxO6
MD5 SHA1 SHA512 SSDEEP

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i1szC.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\i1szC.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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i1szC.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\i1szC.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/1152-151-0x0000000000400000-0x000000000157C000-memory.dmp

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memory/1152-142-0x0000000000400000-0x000000000157C000-memory.dmp

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memory/1152-143-0x0000000000400000-0x000000000157C000-memory.dmp

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memory/1152-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/1152-154-0x0000000000400000-0x000000000157C000-memory.dmp

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memory/4252-138-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4252-132-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4252-155-0x0000000000400000-0x0000000000418000-memory.dmp

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