nymaim | fb723bd21e3831ad04de749114b68e9fef71735c537f290a64a76af0e10b5cbe

Analysis

max time kernel
133s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
01/12/2022, 14:02

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General

Target
file.exe
Size 2.1MB
Sample221201-rb57saee38
SHA256 fb723bd21e3831ad04de749114b68e9fef71735c537f290a64a76af0e10b5cbe
MD5 55897a79692924e915d2d995a30cb7ab
SHA1 661f47b5c6e54ab3a222f5c57d34e1fde1ebd69b
SHA512 3848fdfb517123e257186948117a15f59c1a3acd5754476d8fafc407b7f5c0490cae9c3b8de163e2803d7fdcfa4a35e3515a07abc5a48e064c75713e68613fb9
SSDEEP 49152:42LWtchUPUbMrxJaY/Nqp1xkHZBLrgOi5AeAgyh019HTEvzpAG5cyD:4t62U+DaYl8hbvAgyh01pArpXcyD
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
3628	is-CU6CH.tmp
2156	PrintFolders.exe
5060	hV4b6.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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
3628	is-CU6CH.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-CU6CH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-1VLSR.tmp	is-CU6CH.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-CU6CH.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-CU6CH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-DRORC.tmp	is-CU6CH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-NAPQQ.tmp	is-CU6CH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-V7P8A.tmp	is-CU6CH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-GA2SU.tmp	is-CU6CH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-75PQC.tmp	is-CU6CH.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
1440	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2156	PrintFolders.exe
2156	PrintFolders.exe
2156	PrintFolders.exe
2156	PrintFolders.exe
2156	PrintFolders.exe
2156	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1440	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2820 wrote to memory of 3628	2820	file.exe	79
PID 2820 wrote to memory of 3628	2820	file.exe	79
PID 2820 wrote to memory of 3628	2820	file.exe	79
PID 3628 wrote to memory of 2156	3628	is-CU6CH.tmp	80
PID 3628 wrote to memory of 2156	3628	is-CU6CH.tmp	80
PID 3628 wrote to memory of 2156	3628	is-CU6CH.tmp	80
PID 2156 wrote to memory of 5060	2156	PrintFolders.exe	81
PID 2156 wrote to memory of 5060	2156	PrintFolders.exe	81
PID 2156 wrote to memory of 5060	2156	PrintFolders.exe	81
PID 2156 wrote to memory of 4664	2156	PrintFolders.exe	83
PID 2156 wrote to memory of 4664	2156	PrintFolders.exe	83
PID 2156 wrote to memory of 4664	2156	PrintFolders.exe	83
PID 4664 wrote to memory of 1440	4664	cmd.exe	85
PID 4664 wrote to memory of 1440	4664	cmd.exe	85
PID 4664 wrote to memory of 1440	4664	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2820
- C:\Users\Admin\AppData\Local\Temp\is-4BGP9.tmp\is-CU6CH.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-4BGP9.tmp\is-CU6CH.tmp" /SL4 $90068 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1942140 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:3628
- - 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 use of WriteProcessMemory
    PID:2156
  - - C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\hV4b6.exe
      4⤵
      Executes dropped EXE
      PID:5060
  - - 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:4664
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1440

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

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Downloads

PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 3.2MB
SHA256 4543f722f1a214c8cd0df188c5b012b1a2b3ed33b8e398fdb9a525e27ad5ac62
MD5 baf0cf141192543ea45e9e4208587134
SHA1 c354eac0452d484f0d53befe5e525700e9a9bda0
SHA512 8d1c1e63addecf45abb9bf3d7c583f5be7d81e79cbe06f405c134cbd584b90e6437618ace0c2d2f1b358ffb967a52d7715081f2c8ba228f43ded1f4328f4b92f
SSDEEP 49152:qToL01sgmir63VSOIw+5rejQpj3D+WVqd:io4sgRrKVSDw+tejQV3D+WVqd
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 3.2MB
SHA256 4543f722f1a214c8cd0df188c5b012b1a2b3ed33b8e398fdb9a525e27ad5ac62
MD5 baf0cf141192543ea45e9e4208587134
SHA1 c354eac0452d484f0d53befe5e525700e9a9bda0
SHA512 8d1c1e63addecf45abb9bf3d7c583f5be7d81e79cbe06f405c134cbd584b90e6437618ace0c2d2f1b358ffb967a52d7715081f2c8ba228f43ded1f4328f4b92f
SSDEEP 49152:qToL01sgmir63VSOIw+5rejQpj3D+WVqd:io4sgRrKVSDw+tejQV3D+WVqd
MD5 SHA1 SHA512 SSDEEP

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is-CU6CH.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-4BGP9.tmp\is-CU6CH.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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is-CU6CH.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-4BGP9.tmp\is-CU6CH.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-7P12H.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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hV4b6.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\hV4b6.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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hV4b6.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\hV4b6.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/2156-142-0x0000000000400000-0x0000000001535000-memory.dmp

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memory/2156-143-0x0000000000400000-0x0000000001535000-memory.dmp

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memory/2156-144-0x0000000000400000-0x0000000001535000-memory.dmp

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memory/2156-148-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/2156-152-0x0000000000400000-0x0000000001535000-memory.dmp

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memory/2156-155-0x0000000000400000-0x0000000001535000-memory.dmp

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memory/2820-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/2820-137-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/2820-156-0x0000000000400000-0x0000000000413000-memory.dmp

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