nymaim | 3ffaebbd54c2c05eec7dd99e226b1486665a8061d22ec23d7c6590db134b936f

Analysis

max time kernel
152s
max time network
163s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
26/11/2022, 23:02

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General

Target
file.exe
Size 2.1MB
Sample221126-2z4c7sbf76
SHA256 3ffaebbd54c2c05eec7dd99e226b1486665a8061d22ec23d7c6590db134b936f
MD5 5797b940fdec8bc49565b20b998016c1
SHA1 c808f36ad5f680f33930de60d73294582b9bdda9
SHA512 f41ec69531fd6eb6df6950a396766b917f4b08435646b73c9b2cda63d184abf89f8c6d62cef210534ebd4ed57da4f803b31b3be45cf83e08f3dc4ef0d7da42f8
SSDEEP 49152:MLiNrp+XZGYHHsqJjmh8Pv+gkkL521gK2K5+njZxAG5cyv:MLYwXZGYHHsW33+rkL522BnjPXcyv
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
736	is-815AV.tmp
4904	PrintFolders.exe
4452	QmYvRnFj.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
736	is-815AV.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-4L8DJ.tmp	is-815AV.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-815AV.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-815AV.tmp
File created	C:\Program Files (x86)\PrintFolders\is-0V0S8.tmp	is-815AV.tmp
File created	C:\Program Files (x86)\PrintFolders\is-0M6JU.tmp	is-815AV.tmp
File created	C:\Program Files (x86)\PrintFolders\is-FJIU5.tmp	is-815AV.tmp
File created	C:\Program Files (x86)\PrintFolders\is-FIN29.tmp	is-815AV.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-815AV.tmp
File created	C:\Program Files (x86)\PrintFolders\is-DS0SO.tmp	is-815AV.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
4904	PrintFolders.exe
4904	PrintFolders.exe
4904	PrintFolders.exe
4904	PrintFolders.exe
4904	PrintFolders.exe
4904	PrintFolders.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4904	PrintFolders.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 3032 wrote to memory of 736	3032	file.exe	80
PID 3032 wrote to memory of 736	3032	file.exe	80
PID 3032 wrote to memory of 736	3032	file.exe	80
PID 736 wrote to memory of 4904	736	is-815AV.tmp	81
PID 736 wrote to memory of 4904	736	is-815AV.tmp	81
PID 736 wrote to memory of 4904	736	is-815AV.tmp	81
PID 4904 wrote to memory of 4452	4904	PrintFolders.exe	84
PID 4904 wrote to memory of 4452	4904	PrintFolders.exe	84
PID 4904 wrote to memory of 4452	4904	PrintFolders.exe	84
PID 4904 wrote to memory of 5068	4904	PrintFolders.exe	91
PID 4904 wrote to memory of 5068	4904	PrintFolders.exe	91
PID 4904 wrote to memory of 5068	4904	PrintFolders.exe	91
PID 5068 wrote to memory of 3456	5068	cmd.exe	93
PID 5068 wrote to memory of 3456	5068	cmd.exe	93
PID 5068 wrote to memory of 3456	5068	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3032
- C:\Users\Admin\AppData\Local\Temp\is-5L0LJ.tmp\is-815AV.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-5L0LJ.tmp\is-815AV.tmp" /SL4 $90058 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1964588 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:736
- - 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:4904
  - - C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\QmYvRnFj.exe
      4⤵
      Executes dropped EXE
      PID:4452
  - - 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:5068
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.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

PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 3.3MB
SHA256 b5f92fa308743be6368cfaddb4ea55628a7abb9419f97aacf1fb2f5c7a2ee159
MD5 2fd318a39b72535678e3a2c1e97e0140
SHA1 c4d054ea633f13aba8c896b4639c268d35db6119
SHA512 2cfa0de5f3f6e4950e48f3d834ca3ad35becc72a8ff1a59325415c3dc80d0742db4f44053fa95f1997b1e8c7c7e5e83a61ec6907d12657f1e9485c50e36c193e
SSDEEP 49152:htHls6HX0H6/3j/ywe0t4CbCsDelRVsgkEM:htHls6HX0a/Tywe0t4uHilRVnkJ
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 3.3MB
SHA256 b5f92fa308743be6368cfaddb4ea55628a7abb9419f97aacf1fb2f5c7a2ee159
MD5 2fd318a39b72535678e3a2c1e97e0140
SHA1 c4d054ea633f13aba8c896b4639c268d35db6119
SHA512 2cfa0de5f3f6e4950e48f3d834ca3ad35becc72a8ff1a59325415c3dc80d0742db4f44053fa95f1997b1e8c7c7e5e83a61ec6907d12657f1e9485c50e36c193e
SSDEEP 49152:htHls6HX0H6/3j/ywe0t4CbCsDelRVsgkEM:htHls6HX0a/Tywe0t4uHilRVnkJ
MD5 SHA1 SHA512 SSDEEP

Submit Download

is-815AV.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-5L0LJ.tmp\is-815AV.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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is-815AV.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-5L0LJ.tmp\is-815AV.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-9AING.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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QmYvRnFj.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\QmYvRnFj.exe
Size 72KB
SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
MD5 3fb36cb0b7172e5298d2992d42984d06
SHA1 439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA512 6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
SSDEEP 1536:bvUpDLxyxA14o3/M238r6+XfHAgbqmE8MpKdwuasZLUM7DsWlXcdyZgfmi:WDLZKa/MtXfHAgbqmEtxsfmyZgfmi
MD5 SHA1 SHA512 SSDEEP

Submit Download

QmYvRnFj.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\QmYvRnFj.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/3032-157-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/3032-134-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/3032-139-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/3032-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/4904-144-0x0000000000400000-0x0000000001549000-memory.dmp

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memory/4904-146-0x0000000000400000-0x0000000001549000-memory.dmp

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memory/4904-145-0x0000000000400000-0x0000000001549000-memory.dmp

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memory/4904-150-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4904-143-0x0000000000400000-0x0000000001549000-memory.dmp

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memory/4904-156-0x0000000000400000-0x0000000001549000-memory.dmp

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