nymaim | 84022728d6ab76746628f3c3133610f467cd30dcaa96dcdd7f6baba57f997b46

Analysis

max time kernel
93s
max time network
141s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
07/12/2022, 00:48

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General

Target
file.exe
Size 3.5MB
Sample221207-a5sp4sad24
SHA256 84022728d6ab76746628f3c3133610f467cd30dcaa96dcdd7f6baba57f997b46
MD5 a46e5ec245cf1800a3d0b7793654494d
SHA1 1eca74e2c4e264c8c0f03ab7598195969fb65ba9
SHA512 8477d33171b973dc7d4fb2f1ab3a180a764d8afee578a0e1f18ae8a3b969f1fbfb34aa512675360aa4832c7a22af262635194ee6079984eed07450edb1767014
SSDEEP 98304:Crs/Q8PsbeW70a3BKIozfdRn/3iHBtmEbyeTc6DEDuqJn+iSd:2s/Q8UbeITbozllinmO7c6IDusQ
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
640	is-R0CJ6.tmp
4896	PrintFolders.exe
2188	lJKrC69.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
640	is-R0CJ6.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-R0CJ6.tmp
File created	C:\Program Files (x86)\PrintFolders\is-37H92.tmp	is-R0CJ6.tmp
File created	C:\Program Files (x86)\PrintFolders\is-CT7B7.tmp	is-R0CJ6.tmp
File created	C:\Program Files (x86)\PrintFolders\is-H91QO.tmp	is-R0CJ6.tmp
File created	C:\Program Files (x86)\PrintFolders\is-MQMRN.tmp	is-R0CJ6.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-R0CJ6.tmp
File created	C:\Program Files (x86)\PrintFolders\is-8E7GI.tmp	is-R0CJ6.tmp
File created	C:\Program Files (x86)\PrintFolders\is-OUR0P.tmp	is-R0CJ6.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-R0CJ6.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
4236	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4896	PrintFolders.exe
4896	PrintFolders.exe
4896	PrintFolders.exe
4896	PrintFolders.exe
4896	PrintFolders.exe
4896	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4236	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3156 wrote to memory of 640	3156	file.exe	80
PID 3156 wrote to memory of 640	3156	file.exe	80
PID 3156 wrote to memory of 640	3156	file.exe	80
PID 640 wrote to memory of 4896	640	is-R0CJ6.tmp	81
PID 640 wrote to memory of 4896	640	is-R0CJ6.tmp	81
PID 640 wrote to memory of 4896	640	is-R0CJ6.tmp	81
PID 4896 wrote to memory of 2188	4896	PrintFolders.exe	82
PID 4896 wrote to memory of 2188	4896	PrintFolders.exe	82
PID 4896 wrote to memory of 2188	4896	PrintFolders.exe	82
PID 4896 wrote to memory of 4936	4896	PrintFolders.exe	90
PID 4896 wrote to memory of 4936	4896	PrintFolders.exe	90
PID 4896 wrote to memory of 4936	4896	PrintFolders.exe	90
PID 4936 wrote to memory of 4236	4936	cmd.exe	92
PID 4936 wrote to memory of 4236	4936	cmd.exe	92
PID 4936 wrote to memory of 4236	4936	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:3156
- C:\Users\Admin\AppData\Local\Temp\is-G6FGO.tmp\is-R0CJ6.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-G6FGO.tmp\is-R0CJ6.tmp" /SL4 $501C0 "C:\Users\Admin\AppData\Local\Temp\file.exe" 3459606 96256
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:640
- - 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:4896
  - - C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\lJKrC69.exe
      4⤵
      Executes dropped EXE
      PID:2188
  - - 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:4936
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4236

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 6.1MB
SHA256 5f7bbb529f03b2179af094b7b635d998dc648ee1ebbf186ca7bcca470828b4c9
MD5 c49f484960b97c58a2bc4e2df6bc9553
SHA1 63bae1164ef545f274453d82e3f392519b29f4d1
SHA512 36cc638e17e6fcdc39036efdc7919a3588b715abd891e9bde708182d6055a798013b20bbb3b0c3ea786be90c7606ed3063d3e61da36744d82c16368f75e65e22
SSDEEP 98304:mmjd75PniyBESTaFn+Do4twmQXLD0C1NQcRa:m075FE4a2p+Xa
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 6.1MB
SHA256 5f7bbb529f03b2179af094b7b635d998dc648ee1ebbf186ca7bcca470828b4c9
MD5 c49f484960b97c58a2bc4e2df6bc9553
SHA1 63bae1164ef545f274453d82e3f392519b29f4d1
SHA512 36cc638e17e6fcdc39036efdc7919a3588b715abd891e9bde708182d6055a798013b20bbb3b0c3ea786be90c7606ed3063d3e61da36744d82c16368f75e65e22
SSDEEP 98304:mmjd75PniyBESTaFn+Do4twmQXLD0C1NQcRa:m075FE4a2p+Xa
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

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

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is-R0CJ6.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-G6FGO.tmp\is-R0CJ6.tmp
Size 687KB
SHA256 cec47d181cf1dad856463fc237ead179ffa5ab1f2aeeec442a99ee83c7db5cb2
MD5 075f33da1ee1e9c480243cac029b3c3e
SHA1 496cba41dd1b8878f7e10c3affb293231ca97ed3
SHA512 3c90572fa0151a9c1d557109f995f2093b9a043808675bd6ff6fd543bf364d826be04d0dfd60062670e4e8edb8f7b24f8bbd5a5f056c3f628aacf2175c3fe8db
SSDEEP 12288:gh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv6jfxOM:y5NoqWolrP837JzHvA6yknyWFxvwxOM
MD5 SHA1 SHA512 SSDEEP

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is-R0CJ6.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-G6FGO.tmp\is-R0CJ6.tmp
Size 687KB
SHA256 cec47d181cf1dad856463fc237ead179ffa5ab1f2aeeec442a99ee83c7db5cb2
MD5 075f33da1ee1e9c480243cac029b3c3e
SHA1 496cba41dd1b8878f7e10c3affb293231ca97ed3
SHA512 3c90572fa0151a9c1d557109f995f2093b9a043808675bd6ff6fd543bf364d826be04d0dfd60062670e4e8edb8f7b24f8bbd5a5f056c3f628aacf2175c3fe8db
SSDEEP 12288:gh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv6jfxOM:y5NoqWolrP837JzHvA6yknyWFxvwxOM
MD5 SHA1 SHA512 SSDEEP

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lJKrC69.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\lJKrC69.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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lJKrC69.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\lJKrC69.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/3156-156-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/3156-132-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/3156-134-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/4896-143-0x0000000000400000-0x0000000001810000-memory.dmp

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memory/4896-144-0x0000000000400000-0x0000000001810000-memory.dmp

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memory/4896-148-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4896-152-0x0000000000400000-0x0000000001810000-memory.dmp

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memory/4896-142-0x0000000000400000-0x0000000001810000-memory.dmp

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memory/4896-155-0x0000000000400000-0x0000000001810000-memory.dmp

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