nymaim | d41a54de9155ad67d58b4cfb620269cc13b93de95312e4318ee16c3d9bdc095c

Analysis

max time kernel
91s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
07/12/2022, 00:02

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General

Target
file.exe
Size 3.6MB
Sample221207-abf48agb28
SHA256 d41a54de9155ad67d58b4cfb620269cc13b93de95312e4318ee16c3d9bdc095c
MD5 67961b7ca691ec50db823239136df94d
SHA1 d0ddc697e05911535ee3d99b960ef817b22b0cbc
SHA512 76f2aaa9c0be1396b0a210a2cb012f4efc067e33b0de824a8afe53a515857e2af3ed55d8652f999f8a93eec810592b2ff1519cb38df57dfd59048bc8263c4c97
SSDEEP 98304:eh2xTwcaSCCvbcLLz4csVNm6viW6jqx01JFDqzT:g2xccavzLo1MW6jGODm
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
3540	is-R0DOT.tmp
5000	PrintFolders.exe
4820	k2iDgQ.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
3540	is-R0DOT.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-R8BUD.tmp	is-R0DOT.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-R0DOT.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-R0DOT.tmp
File created	C:\Program Files (x86)\PrintFolders\is-LMMTV.tmp	is-R0DOT.tmp
File created	C:\Program Files (x86)\PrintFolders\is-RAMO6.tmp	is-R0DOT.tmp
File created	C:\Program Files (x86)\PrintFolders\is-U7G1R.tmp	is-R0DOT.tmp
File created	C:\Program Files (x86)\PrintFolders\is-ENSPA.tmp	is-R0DOT.tmp
File created	C:\Program Files (x86)\PrintFolders\is-2LIAD.tmp	is-R0DOT.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-R0DOT.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
5108	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
5000	PrintFolders.exe
5000	PrintFolders.exe
5000	PrintFolders.exe
5000	PrintFolders.exe
5000	PrintFolders.exe
5000	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5108	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4800 wrote to memory of 3540	4800	file.exe	80
PID 4800 wrote to memory of 3540	4800	file.exe	80
PID 4800 wrote to memory of 3540	4800	file.exe	80
PID 3540 wrote to memory of 5000	3540	is-R0DOT.tmp	81
PID 3540 wrote to memory of 5000	3540	is-R0DOT.tmp	81
PID 3540 wrote to memory of 5000	3540	is-R0DOT.tmp	81
PID 5000 wrote to memory of 4820	5000	PrintFolders.exe	82
PID 5000 wrote to memory of 4820	5000	PrintFolders.exe	82
PID 5000 wrote to memory of 4820	5000	PrintFolders.exe	82
PID 5000 wrote to memory of 220	5000	PrintFolders.exe	88
PID 5000 wrote to memory of 220	5000	PrintFolders.exe	88
PID 5000 wrote to memory of 220	5000	PrintFolders.exe	88
PID 220 wrote to memory of 5108	220	cmd.exe	90
PID 220 wrote to memory of 5108	220	cmd.exe	90
PID 220 wrote to memory of 5108	220	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4800
- C:\Users\Admin\AppData\Local\Temp\is-LFJNU.tmp\is-R0DOT.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-LFJNU.tmp\is-R0DOT.tmp" /SL4 $801D0 "C:\Users\Admin\AppData\Local\Temp\file.exe" 3478903 96256
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:3540
- - 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:5000
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\k2iDgQ.exe
      4⤵
      Executes dropped EXE
      PID:4820
  - - 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:220
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:5108

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 7a55331438872b9af79ee9f48bb959e98b502f2ee38d0eec74b6b3ad77847319
MD5 a59aa84bec247e3ce50d542e652b4d29
SHA1 cfba43fe5b29e9f4fda3d912f077047312b5e32e
SHA512 b4eaad2231cc00f4f0a8d29e118c68ae5b7474b486820fc0bc506986fb4d78dab19ec28a7a61ba0da0343e5e62bfee7e2f846cee4362486e3e7a27155d98c305
SSDEEP 98304:QcBFjd75PniyBES+IxWndfD0q8nLHVsMaxbVhX82:r75FEEYq2
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 6.1MB
SHA256 7a55331438872b9af79ee9f48bb959e98b502f2ee38d0eec74b6b3ad77847319
MD5 a59aa84bec247e3ce50d542e652b4d29
SHA1 cfba43fe5b29e9f4fda3d912f077047312b5e32e
SHA512 b4eaad2231cc00f4f0a8d29e118c68ae5b7474b486820fc0bc506986fb4d78dab19ec28a7a61ba0da0343e5e62bfee7e2f846cee4362486e3e7a27155d98c305
SSDEEP 98304:QcBFjd75PniyBES+IxWndfD0q8nLHVsMaxbVhX82:r75FEEYq2
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-BI4LI.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-R0DOT.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-LFJNU.tmp\is-R0DOT.tmp
Size 687KB
SHA256 cec47d181cf1dad856463fc237ead179ffa5ab1f2aeeec442a99ee83c7db5cb2
MD5 075f33da1ee1e9c480243cac029b3c3e
SHA1 496cba41dd1b8878f7e10c3affb293231ca97ed3
SHA512 3c90572fa0151a9c1d557109f995f2093b9a043808675bd6ff6fd543bf364d826be04d0dfd60062670e4e8edb8f7b24f8bbd5a5f056c3f628aacf2175c3fe8db
SSDEEP 12288:gh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv6jfxOM:y5NoqWolrP837JzHvA6yknyWFxvwxOM
MD5 SHA1 SHA512 SSDEEP

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is-R0DOT.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-LFJNU.tmp\is-R0DOT.tmp
Size 687KB
SHA256 cec47d181cf1dad856463fc237ead179ffa5ab1f2aeeec442a99ee83c7db5cb2
MD5 075f33da1ee1e9c480243cac029b3c3e
SHA1 496cba41dd1b8878f7e10c3affb293231ca97ed3
SHA512 3c90572fa0151a9c1d557109f995f2093b9a043808675bd6ff6fd543bf364d826be04d0dfd60062670e4e8edb8f7b24f8bbd5a5f056c3f628aacf2175c3fe8db
SSDEEP 12288:gh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv6jfxOM:y5NoqWolrP837JzHvA6yknyWFxvwxOM
MD5 SHA1 SHA512 SSDEEP

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k2iDgQ.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\k2iDgQ.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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k2iDgQ.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\k2iDgQ.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/4800-155-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/4800-138-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/4800-132-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/5000-143-0x0000000000400000-0x0000000001810000-memory.dmp

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memory/5000-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/5000-151-0x0000000000400000-0x0000000001810000-memory.dmp

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memory/5000-142-0x0000000000400000-0x0000000001810000-memory.dmp

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memory/5000-154-0x0000000000400000-0x0000000001810000-memory.dmp

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