nymaim | 16629977b0e9324ea86e1cdb7ea5c782d6043ea56d64b35dd167de4547774804

Analysis

max time kernel
131s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
24/11/2022, 00:32

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General

Target
file.exe
Size 1.4MB
Sample221124-avmfcaaf4t
SHA256 16629977b0e9324ea86e1cdb7ea5c782d6043ea56d64b35dd167de4547774804
MD5 0f47b10f9ff12abc1402109be616a3a1
SHA1 f84e4a57747020efa1e0bb11cfc0f498ff835bcf
SHA512 b916161ae035e9f574d93179d2529db88d77350b8a64b41677c5a60148d684b696012f49c27f2e7981751e85434ae23ea1d7ccefde13f0683d29dc7fb46898de
SSDEEP 24576:NizQxlLVW0UY+IihbaAogkFyCPmbKVCGkAFo6/yNgHil0i/LsGyYSagZIY7eCLx7:mQxlLVs5FrogwyCGDAcgHmSPNeVin
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
644	is-CIBK0.tmp
4532	PrintFolders.exe
2040	wdgm79g1.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
644	is-CIBK0.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 opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-CIBK0.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-CIBK0.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-CIBK0.tmp
File created	C:\Program Files (x86)\PrintFolders\is-U3TSG.tmp	is-CIBK0.tmp
File created	C:\Program Files (x86)\PrintFolders\is-LVOLO.tmp	is-CIBK0.tmp
File created	C:\Program Files (x86)\PrintFolders\is-7B275.tmp	is-CIBK0.tmp
File created	C:\Program Files (x86)\PrintFolders\is-AANP8.tmp	is-CIBK0.tmp
File created	C:\Program Files (x86)\PrintFolders\is-JDP4U.tmp	is-CIBK0.tmp
File created	C:\Program Files (x86)\PrintFolders\is-LS52J.tmp	is-CIBK0.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
1400	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4532	PrintFolders.exe
4532	PrintFolders.exe
4532	PrintFolders.exe
4532	PrintFolders.exe
4532	PrintFolders.exe
4532	PrintFolders.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4532	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1400	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 540 wrote to memory of 644	540	file.exe	81
PID 540 wrote to memory of 644	540	file.exe	81
PID 540 wrote to memory of 644	540	file.exe	81
PID 644 wrote to memory of 4532	644	is-CIBK0.tmp	82
PID 644 wrote to memory of 4532	644	is-CIBK0.tmp	82
PID 644 wrote to memory of 4532	644	is-CIBK0.tmp	82
PID 4532 wrote to memory of 2040	4532	PrintFolders.exe	83
PID 4532 wrote to memory of 2040	4532	PrintFolders.exe	83
PID 4532 wrote to memory of 2040	4532	PrintFolders.exe	83
PID 4532 wrote to memory of 1392	4532	PrintFolders.exe	86
PID 4532 wrote to memory of 1392	4532	PrintFolders.exe	86
PID 4532 wrote to memory of 1392	4532	PrintFolders.exe	86
PID 1392 wrote to memory of 1400	1392	cmd.exe	88
PID 1392 wrote to memory of 1400	1392	cmd.exe	88
PID 1392 wrote to memory of 1400	1392	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:540
- C:\Users\Admin\AppData\Local\Temp\is-CHJ74.tmp\is-CIBK0.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-CHJ74.tmp\is-CIBK0.tmp" /SL4 $C0046 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1235078 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:644
- - 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 behavior: GetForegroundWindowSpam
    - Suspicious use of WriteProcessMemory
    PID:4532
  - - C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\wdgm79g1.exe
      4⤵
      Executes dropped EXE
      PID:2040
  - - 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:1392
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1400

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 1.6MB
SHA256 303d80876b488334fd2a46da23016f0ef7fb100f9c12c822322d43605f059dfa
MD5 096eaa32de46677b252fa255e7f93032
SHA1 0264df59c95408a99d39cfdd26b1d5f6f47d12ec
SHA512 72e37e6cb4f6e1e4de13df9bc06e1c25e75826bcf47b418148441e914cd7736e3d74607c8e9c5f65c72133f20a3ca6254e74952027d96f184a27bd32a47bcb70
SSDEEP 49152:eidpDs+bFkuEeckT2GOplTjUbbLR+mHrnvLz:xH6/W7OplTjCwKLzz
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 1.6MB
SHA256 303d80876b488334fd2a46da23016f0ef7fb100f9c12c822322d43605f059dfa
MD5 096eaa32de46677b252fa255e7f93032
SHA1 0264df59c95408a99d39cfdd26b1d5f6f47d12ec
SHA512 72e37e6cb4f6e1e4de13df9bc06e1c25e75826bcf47b418148441e914cd7736e3d74607c8e9c5f65c72133f20a3ca6254e74952027d96f184a27bd32a47bcb70
SSDEEP 49152:eidpDs+bFkuEeckT2GOplTjUbbLR+mHrnvLz:xH6/W7OplTjCwKLzz
MD5 SHA1 SHA512 SSDEEP

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is-CIBK0.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-CHJ74.tmp\is-CIBK0.tmp
Size 643KB
SHA256 1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7
MD5 85b94e72c3f2d2b5464e2aaf3c9e242a
SHA1 ce7ccae5f50a990d059d59292d4a332979e162ba
SHA512 c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880
SSDEEP 12288:Oh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvJxO0:05NoqWolrP837JzHvA6yknyWFxvJxO0
MD5 SHA1 SHA512 SSDEEP

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is-CIBK0.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-CHJ74.tmp\is-CIBK0.tmp
Size 643KB
SHA256 1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7
MD5 85b94e72c3f2d2b5464e2aaf3c9e242a
SHA1 ce7ccae5f50a990d059d59292d4a332979e162ba
SHA512 c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880
SSDEEP 12288:Oh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvJxO0:05NoqWolrP837JzHvA6yknyWFxvJxO0
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-GUG8A.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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wdgm79g1.exe

Path C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\wdgm79g1.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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wdgm79g1.exe

Path C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\wdgm79g1.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/540-155-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/540-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/540-137-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/4532-143-0x0000000000400000-0x00000000013A3000-memory.dmp

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memory/4532-148-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4532-147-0x0000000000400000-0x00000000013A3000-memory.dmp

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memory/4532-142-0x0000000000400000-0x00000000013A3000-memory.dmp

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memory/4532-154-0x0000000000400000-0x00000000013A3000-memory.dmp

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