nymaim | 0f241bf87c0249f2a9bba6b89997db53d44286281a4a7a58babd49fa2032e2fe

Analysis

max time kernel
148s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
02/12/2022, 17:01

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General

Target
file.exe
Size 2.0MB
Sample221202-vjk4csbc71
SHA256 0f241bf87c0249f2a9bba6b89997db53d44286281a4a7a58babd49fa2032e2fe
MD5 2ae945bdb420203bd602b9f075d57fe6
SHA1 8a79c111d8bb72daa841b31ce8ce6758a21fdf4b
SHA512 9e1a2e8cfc43e1aa46a32f64d11d5cb77ab8c164b215258f42435650f2e90d15c2f1bb07549a725ad9313aab5197e054a2fd9cf796f6493db5327f8ec2045e15
SSDEEP 49152:YJxUwQLVfQw6MIrru11rCw9dE+oYb+HEtb2zFf2TdzAG5cyk:YvGhIrCawfE+oYb+HEteeJXcyk
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
1508	is-GT429.tmp
4220	PrintFolders.exe
3112	ERRRHRKwKad1.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	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
1508	is-GT429.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-JQHP4.tmp	is-GT429.tmp
File created	C:\Program Files (x86)\PrintFolders\is-7UMNK.tmp	is-GT429.tmp
File created	C:\Program Files (x86)\PrintFolders\is-OLB08.tmp	is-GT429.tmp
File created	C:\Program Files (x86)\PrintFolders\is-N2L61.tmp	is-GT429.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-GT429.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-GT429.tmp
File created	C:\Program Files (x86)\PrintFolders\is-96K11.tmp	is-GT429.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-GT429.tmp
File created	C:\Program Files (x86)\PrintFolders\is-O81SL.tmp	is-GT429.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
2396	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4220	PrintFolders.exe
4220	PrintFolders.exe
4220	PrintFolders.exe
4220	PrintFolders.exe
4220	PrintFolders.exe
4220	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2396	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2080 wrote to memory of 1508	2080	file.exe	61
PID 2080 wrote to memory of 1508	2080	file.exe	61
PID 2080 wrote to memory of 1508	2080	file.exe	61
PID 1508 wrote to memory of 4220	1508	is-GT429.tmp	80
PID 1508 wrote to memory of 4220	1508	is-GT429.tmp	80
PID 1508 wrote to memory of 4220	1508	is-GT429.tmp	80
PID 4220 wrote to memory of 3112	4220	PrintFolders.exe	81
PID 4220 wrote to memory of 3112	4220	PrintFolders.exe	81
PID 4220 wrote to memory of 3112	4220	PrintFolders.exe	81
PID 4220 wrote to memory of 4120	4220	PrintFolders.exe	90
PID 4220 wrote to memory of 4120	4220	PrintFolders.exe	90
PID 4220 wrote to memory of 4120	4220	PrintFolders.exe	90
PID 4120 wrote to memory of 2396	4120	cmd.exe	92
PID 4120 wrote to memory of 2396	4120	cmd.exe	92
PID 4120 wrote to memory of 2396	4120	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2080
- C:\Users\Admin\AppData\Local\Temp\is-EO00L.tmp\is-GT429.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-EO00L.tmp\is-GT429.tmp" /SL4 $40028 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1909883 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:1508
- - 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:4220
  - - C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\ERRRHRKwKad1.exe
      4⤵
      Executes dropped EXE
      PID:3112
  - - 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:4120
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2396

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 3.3MB
SHA256 c3ab705bec51929e79129b4d5e1e54e819420b0cff7c90eced2e5133cb063d0e
MD5 46379ff9d4fff3d53b753d5dbe5c9b30
SHA1 feff2d50473a349d16f4cf5a99757af23d65cf44
SHA512 70b4902efba491ae36e9161d125f8bc91bf826aa6254a9dc86829873a0f9a012f6908e2c6e08979e705c8c601dc4dcbc32890330815ebb657e78e4438b32353c
SSDEEP 49152:7HwtLsd/O3E1qk9LBuZ97frDKK01n37JMbadIL8:Qs/qcqSBuZ97frDKK01n37JMbadIL8
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 3.3MB
SHA256 c3ab705bec51929e79129b4d5e1e54e819420b0cff7c90eced2e5133cb063d0e
MD5 46379ff9d4fff3d53b753d5dbe5c9b30
SHA1 feff2d50473a349d16f4cf5a99757af23d65cf44
SHA512 70b4902efba491ae36e9161d125f8bc91bf826aa6254a9dc86829873a0f9a012f6908e2c6e08979e705c8c601dc4dcbc32890330815ebb657e78e4438b32353c
SSDEEP 49152:7HwtLsd/O3E1qk9LBuZ97frDKK01n37JMbadIL8:Qs/qcqSBuZ97frDKK01n37JMbadIL8
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-6O26S.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-GT429.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-EO00L.tmp\is-GT429.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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is-GT429.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-EO00L.tmp\is-GT429.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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ERRRHRKwKad1.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\ERRRHRKwKad1.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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ERRRHRKwKad1.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\ERRRHRKwKad1.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/2080-137-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/2080-156-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/2080-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/4220-143-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/4220-148-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4220-152-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/4220-144-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/4220-142-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/4220-155-0x0000000000400000-0x0000000001552000-memory.dmp

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