nymaim | f53c32f5184945f4e3d4ccd06a2f9941c25de95205a8bbfa12e71777cf5e33f4

Analysis

max time kernel
83s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
14/12/2022, 03:16

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General

Target
file.exe
Size 2.3MB
Sample221214-dsf3bshb37
SHA256 f53c32f5184945f4e3d4ccd06a2f9941c25de95205a8bbfa12e71777cf5e33f4
MD5 092eec68cb1715cb8f4b90d8df99b92e
SHA1 7b8074cd6162c39e92dcf0721efe8bf0d792da78
SHA512 925a04b6cc17c264f4a33d9c073d22ae1ddebb842bc3f1225ae724477f50670b1cceda235c7e9db956f366a67b4d74261c1d0e69126fc4d01d163159dfcd78de
SSDEEP 49152:YNur/Cg5fRqI7zXrypGa7MadaRZQuUYbZKbtLlrb4leOCgSY/M:YNy/COkIPXiL7MgaRKuUYVEtJ0lcY/M
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
4160	is-D90F4.tmp
4896	nyFolders.exe
4744	x2Fg3I.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-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	nyFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
4160	is-D90F4.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-D90F4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-ART0U.tmp	is-D90F4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-JEUTP.tmp	is-D90F4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-P44PL.tmp	is-D90F4.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\nyFolders.exe	is-D90F4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-8AN8J.tmp	is-D90F4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-S10QS.tmp	is-D90F4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-H3KIH.tmp	is-D90F4.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-D90F4.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
4044	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4896	nyFolders.exe
4896	nyFolders.exe
4896	nyFolders.exe
4896	nyFolders.exe
4896	nyFolders.exe
4896	nyFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4044	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1556 wrote to memory of 4160	1556	file.exe	85
PID 1556 wrote to memory of 4160	1556	file.exe	85
PID 1556 wrote to memory of 4160	1556	file.exe	85
PID 4160 wrote to memory of 4896	4160	is-D90F4.tmp	86
PID 4160 wrote to memory of 4896	4160	is-D90F4.tmp	86
PID 4160 wrote to memory of 4896	4160	is-D90F4.tmp	86
PID 4896 wrote to memory of 4744	4896	nyFolders.exe	92
PID 4896 wrote to memory of 4744	4896	nyFolders.exe	92
PID 4896 wrote to memory of 4744	4896	nyFolders.exe	92
PID 4896 wrote to memory of 4124	4896	nyFolders.exe	100
PID 4896 wrote to memory of 4124	4896	nyFolders.exe	100
PID 4896 wrote to memory of 4124	4896	nyFolders.exe	100
PID 4124 wrote to memory of 4044	4124	cmd.exe	102
PID 4124 wrote to memory of 4044	4124	cmd.exe	102
PID 4124 wrote to memory of 4044	4124	cmd.exe	102

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1556
- C:\Users\Admin\AppData\Local\Temp\is-ACUB6.tmp\is-D90F4.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-ACUB6.tmp\is-D90F4.tmp" /SL4 $A004E "C:\Users\Admin\AppData\Local\Temp\file.exe" 2158771 208896
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4160
- - C:\Program Files (x86)\PrintFolders\nyFolders.exe
    "C:\Program Files (x86)\PrintFolders\nyFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4896
  - - C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\x2Fg3I.exe
      4⤵
      Executes dropped EXE
      PID:4744
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "nyFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\nyFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4124
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "nyFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4044

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

nyFolders.exe

Path C:\Program Files (x86)\PrintFolders\nyFolders.exe
Size 3.4MB
SHA256 04f6ece183dab1d5586481a7ed5ed7d728c06a08032d4a13e4847acce911ba63
MD5 6a165e716f9f6eb0907ec3d338ae1a5b
SHA1 4f79ccda91db05dce1b53699cd1284af0e632116
SHA512 01f63e230d00c7b2e0cf130ce9341b083c106af1489fd55b19793210cb3790e8ec40017aea06518f268c4e96b17dd9b1ad44a7b36b7845503c36cdb7dafdadf5
SSDEEP 98304:P6Wfi9UoGjfhy/Vd4zHqA4zC0S+dzIj07L:qyf+DvP7L
MD5 SHA1 SHA512 SSDEEP

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nyFolders.exe

Path C:\Program Files (x86)\PrintFolders\nyFolders.exe
Size 3.4MB
SHA256 04f6ece183dab1d5586481a7ed5ed7d728c06a08032d4a13e4847acce911ba63
MD5 6a165e716f9f6eb0907ec3d338ae1a5b
SHA1 4f79ccda91db05dce1b53699cd1284af0e632116
SHA512 01f63e230d00c7b2e0cf130ce9341b083c106af1489fd55b19793210cb3790e8ec40017aea06518f268c4e96b17dd9b1ad44a7b36b7845503c36cdb7dafdadf5
SSDEEP 98304:P6Wfi9UoGjfhy/Vd4zHqA4zC0S+dzIj07L:qyf+DvP7L
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-22V16.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-D90F4.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-ACUB6.tmp\is-D90F4.tmp
Size 797KB
SHA256 424fb4432fa651db203c38efd930813c49e90f506a7f5465347eff4eda44a711
MD5 fc4bab9305f2a869cb26d22e008f2921
SHA1 9871140128ea98e2cc798f3ef4c3cd546442969f
SHA512 bcaff0260b9cb2a6c3d7aabb7d1b1e02ca8968cdb0715f78db93755b44aa18e8f146b9052dc7fcf54796f044cf779cb989d34db8c17cf9eca53b30acfc708506
SSDEEP 24576:n5NoqWolrP837JzHvA6yknyWFxvSur/TxOu:njrP837JzHvA6pnvFxvSur/1p
MD5 SHA1 SHA512 SSDEEP

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is-D90F4.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-ACUB6.tmp\is-D90F4.tmp
Size 797KB
SHA256 424fb4432fa651db203c38efd930813c49e90f506a7f5465347eff4eda44a711
MD5 fc4bab9305f2a869cb26d22e008f2921
SHA1 9871140128ea98e2cc798f3ef4c3cd546442969f
SHA512 bcaff0260b9cb2a6c3d7aabb7d1b1e02ca8968cdb0715f78db93755b44aa18e8f146b9052dc7fcf54796f044cf779cb989d34db8c17cf9eca53b30acfc708506
SSDEEP 24576:n5NoqWolrP837JzHvA6yknyWFxvSur/TxOu:njrP837JzHvA6pnvFxvSur/1p
MD5 SHA1 SHA512 SSDEEP

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x2Fg3I.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\x2Fg3I.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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x2Fg3I.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\x2Fg3I.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/1556-155-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/1556-132-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/1556-138-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/4896-143-0x0000000000400000-0x0000000001564000-memory.dmp

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memory/4896-151-0x0000000000400000-0x0000000001564000-memory.dmp

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memory/4896-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4896-142-0x0000000000400000-0x0000000001564000-memory.dmp

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memory/4896-154-0x0000000000400000-0x0000000001564000-memory.dmp

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