nymaim | 959378e5289a7cfdcc750a353940c74685d49b2c9623f7e811b09f0b46b6cb26

Analysis

max time kernel
68s
max time network
136s
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, 08:32

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General

Target
file.exe
Size 2.0MB
Sample221201-kfb16sag86
SHA256 959378e5289a7cfdcc750a353940c74685d49b2c9623f7e811b09f0b46b6cb26
MD5 f3b9e0f22157dab69784dfb5446c5c04
SHA1 e3a560eb8c090d26199d259bf470842f68d745d4
SHA512 a5104c960b9fc0a0944ded173aef1505178d9c19858f286f6bbe1677a8e6809354f62c114d24a8751e60500c80fadaae0aa1d8cef4a0c5b052120b48aa4baf91
SSDEEP 49152:4jA6cUxQI9h03yvAUk78hKsZcO+6660QAG5cyi:4jAIxQ4O30EYS66dQXcyi
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
3344	is-EU5L9.tmp
4716	PrintFolders.exe
1868	YdcPuIUBsVy9OR.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
3344	is-EU5L9.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-EU5L9.tmp
File created	C:\Program Files (x86)\PrintFolders\is-C7ML8.tmp	is-EU5L9.tmp
File created	C:\Program Files (x86)\PrintFolders\is-PV49F.tmp	is-EU5L9.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-EU5L9.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-EU5L9.tmp
File created	C:\Program Files (x86)\PrintFolders\is-F3SJJ.tmp	is-EU5L9.tmp
File created	C:\Program Files (x86)\PrintFolders\is-ARUNB.tmp	is-EU5L9.tmp
File created	C:\Program Files (x86)\PrintFolders\is-GRS8F.tmp	is-EU5L9.tmp
File created	C:\Program Files (x86)\PrintFolders\is-OU0JQ.tmp	is-EU5L9.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
2044	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4716	PrintFolders.exe
4716	PrintFolders.exe
4716	PrintFolders.exe
4716	PrintFolders.exe
4716	PrintFolders.exe
4716	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2044	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4512 wrote to memory of 3344	4512	file.exe	80
PID 4512 wrote to memory of 3344	4512	file.exe	80
PID 4512 wrote to memory of 3344	4512	file.exe	80
PID 3344 wrote to memory of 4716	3344	is-EU5L9.tmp	81
PID 3344 wrote to memory of 4716	3344	is-EU5L9.tmp	81
PID 3344 wrote to memory of 4716	3344	is-EU5L9.tmp	81
PID 4716 wrote to memory of 1868	4716	PrintFolders.exe	82
PID 4716 wrote to memory of 1868	4716	PrintFolders.exe	82
PID 4716 wrote to memory of 1868	4716	PrintFolders.exe	82
PID 4716 wrote to memory of 4580	4716	PrintFolders.exe	90
PID 4716 wrote to memory of 4580	4716	PrintFolders.exe	90
PID 4716 wrote to memory of 4580	4716	PrintFolders.exe	90
PID 4580 wrote to memory of 2044	4580	cmd.exe	92
PID 4580 wrote to memory of 2044	4580	cmd.exe	92
PID 4580 wrote to memory of 2044	4580	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:4512
- C:\Users\Admin\AppData\Local\Temp\is-MES67.tmp\is-EU5L9.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-MES67.tmp\is-EU5L9.tmp" /SL4 $A0032 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1906973 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:3344
- - 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:4716
  - - C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\YdcPuIUBsVy9OR.exe
      4⤵
      Executes dropped EXE
      PID:1868
  - - 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:4580
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2044

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 3.2MB
SHA256 60916091618c01ed656bbcd7cc873301ba01a1213ce230fbe4f6ee1432c5d4a6
MD5 14addd4bff2e44ecc34e06b4e651a704
SHA1 59934a8e216dd0c64ce15c7544be8ef5b10722d8
SHA512 f510a9aaef9d03bff0bae43b0cbcaa8464c1b7c38ba2be874d86e00ea56bb6fe37cef78358250f2d271a2a0d04c6a84aea6be974ffb645a1f44fcc1abb7ad968
SSDEEP 49152:wLZWRDLWBdb4502mGLZZ4VqeJAwIP0xg04:QwRDiBdbM02mGLz4VqeuwIP0xg04
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 3.2MB
SHA256 60916091618c01ed656bbcd7cc873301ba01a1213ce230fbe4f6ee1432c5d4a6
MD5 14addd4bff2e44ecc34e06b4e651a704
SHA1 59934a8e216dd0c64ce15c7544be8ef5b10722d8
SHA512 f510a9aaef9d03bff0bae43b0cbcaa8464c1b7c38ba2be874d86e00ea56bb6fe37cef78358250f2d271a2a0d04c6a84aea6be974ffb645a1f44fcc1abb7ad968
SSDEEP 49152:wLZWRDLWBdb4502mGLZZ4VqeJAwIP0xg04:QwRDiBdbM02mGLz4VqeuwIP0xg04
MD5 SHA1 SHA512 SSDEEP

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is-EU5L9.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-MES67.tmp\is-EU5L9.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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is-EU5L9.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-MES67.tmp\is-EU5L9.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-QU1NS.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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YdcPuIUBsVy9OR.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\YdcPuIUBsVy9OR.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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YdcPuIUBsVy9OR.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\YdcPuIUBsVy9OR.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/4512-148-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/4512-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/4512-134-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/4512-157-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/4716-144-0x0000000000400000-0x0000000001535000-memory.dmp

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memory/4716-143-0x0000000000400000-0x0000000001535000-memory.dmp

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memory/4716-142-0x0000000000400000-0x0000000001535000-memory.dmp

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memory/4716-149-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4716-153-0x0000000000400000-0x0000000001535000-memory.dmp

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memory/4716-156-0x0000000000400000-0x0000000001535000-memory.dmp

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