nymaim | 822c4476222aab60b32a74d3a8668b590872ea25f7da21a3a35060babd321b3c

Analysis

max time kernel
72s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
14/12/2022, 03:48

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General

Target
file.exe
Size 2.3MB
Sample221214-ecsa4aca4x
SHA256 822c4476222aab60b32a74d3a8668b590872ea25f7da21a3a35060babd321b3c
MD5 d2e1ff5beb98e5a04ee624f9af48697e
SHA1 7d0eb2729ec02d7210116347c016b17af4626281
SHA512 ac5a8cd5d8987859c074218c65325333e452d6aef3b551fb4ae9113dee35b71204d6f78f4910e654088d08b0936a1806e99bfb673f7ba8c5b68712c4a4fc2616
SSDEEP 49152:oNur/9FMZtQA44tpnetW8FujgyykEBQx3c5fwBYKMbww5eOCgSY/a:oNy/9FSvBret05EB2DBVQwWcY/a
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
2176	is-EE5A2.tmp
4648	nyFolders.exe
5004	a3AxTdxP9GnJ69.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	nyFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
2176	is-EE5A2.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-PI4D7.tmp	is-EE5A2.tmp
File created	C:\Program Files (x86)\PrintFolders\is-6JRTG.tmp	is-EE5A2.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-EE5A2.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-EE5A2.tmp
File created	C:\Program Files (x86)\PrintFolders\is-MU97O.tmp	is-EE5A2.tmp
File created	C:\Program Files (x86)\PrintFolders\is-6VB9S.tmp	is-EE5A2.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\nyFolders.exe	is-EE5A2.tmp
File created	C:\Program Files (x86)\PrintFolders\is-9A59A.tmp	is-EE5A2.tmp
File created	C:\Program Files (x86)\PrintFolders\is-7MPAP.tmp	is-EE5A2.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
2252	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4648	nyFolders.exe
4648	nyFolders.exe
4648	nyFolders.exe
4648	nyFolders.exe
4648	nyFolders.exe
4648	nyFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2252	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 528 wrote to memory of 2176	528	file.exe	79
PID 528 wrote to memory of 2176	528	file.exe	79
PID 528 wrote to memory of 2176	528	file.exe	79
PID 2176 wrote to memory of 4648	2176	is-EE5A2.tmp	80
PID 2176 wrote to memory of 4648	2176	is-EE5A2.tmp	80
PID 2176 wrote to memory of 4648	2176	is-EE5A2.tmp	80
PID 4648 wrote to memory of 5004	4648	nyFolders.exe	81
PID 4648 wrote to memory of 5004	4648	nyFolders.exe	81
PID 4648 wrote to memory of 5004	4648	nyFolders.exe	81
PID 4648 wrote to memory of 1160	4648	nyFolders.exe	89
PID 4648 wrote to memory of 1160	4648	nyFolders.exe	89
PID 4648 wrote to memory of 1160	4648	nyFolders.exe	89
PID 1160 wrote to memory of 2252	1160	cmd.exe	91
PID 1160 wrote to memory of 2252	1160	cmd.exe	91
PID 1160 wrote to memory of 2252	1160	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:528
- C:\Users\Admin\AppData\Local\Temp\is-F0229.tmp\is-EE5A2.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-F0229.tmp\is-EE5A2.tmp" /SL4 $301B8 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2106439 208896
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:2176
- - 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:4648
  - - C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\a3AxTdxP9GnJ69.exe
      4⤵
      Executes dropped EXE
      PID:5004
  - - 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:1160
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "nyFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2252

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 d665b42de8f912e80f89cb05701da7e24c124a5972a150c805956c3189830db0
MD5 c7ea36a83a942183a7468435f1c1b036
SHA1 59d1edef7b8f8f45b63d1b95b006693b0346e145
SHA512 cadd060d5ae8752e8b6974547f71d0ceeb7f1ea4dd9fa5d9f8a4284f5daa8411f6f73298cef4bea4e97563a70998c239b8144ccb5523ffd3710452642d696a5d
SSDEEP 98304:SmqhJyT04kJfhy/SkBj3EztQLIGNjawEuyBKoJGI4:/8f+CBuP
MD5 SHA1 SHA512 SSDEEP

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nyFolders.exe

Path C:\Program Files (x86)\PrintFolders\nyFolders.exe
Size 3.4MB
SHA256 d665b42de8f912e80f89cb05701da7e24c124a5972a150c805956c3189830db0
MD5 c7ea36a83a942183a7468435f1c1b036
SHA1 59d1edef7b8f8f45b63d1b95b006693b0346e145
SHA512 cadd060d5ae8752e8b6974547f71d0ceeb7f1ea4dd9fa5d9f8a4284f5daa8411f6f73298cef4bea4e97563a70998c239b8144ccb5523ffd3710452642d696a5d
SSDEEP 98304:SmqhJyT04kJfhy/SkBj3EztQLIGNjawEuyBKoJGI4:/8f+CBuP
MD5 SHA1 SHA512 SSDEEP

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is-EE5A2.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-F0229.tmp\is-EE5A2.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-EE5A2.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-F0229.tmp\is-EE5A2.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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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-LSAS2.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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a3AxTdxP9GnJ69.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\a3AxTdxP9GnJ69.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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a3AxTdxP9GnJ69.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\a3AxTdxP9GnJ69.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/528-159-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/528-141-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/528-135-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/4648-145-0x0000000000400000-0x0000000001564000-memory.dmp

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memory/4648-151-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4648-155-0x0000000000400000-0x0000000001564000-memory.dmp

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memory/4648-147-0x0000000000400000-0x0000000001564000-memory.dmp

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memory/4648-146-0x0000000000400000-0x0000000001564000-memory.dmp

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memory/4648-158-0x0000000000400000-0x0000000001564000-memory.dmp

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