nymaim | fcac36ffd70de99ffb7f2d987ee16edcf32a3b472e9fa1055a56f9859ab98442

Analysis

max time kernel
163s
max time network
182s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
10/12/2022, 10:01

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General

Target
file.exe
Size 2.5MB
Sample221210-l18fjsfd54
SHA256 fcac36ffd70de99ffb7f2d987ee16edcf32a3b472e9fa1055a56f9859ab98442
MD5 fc4de8ffafceb213618807ef27539678
SHA1 02738d5d20aa8efb2d7411bf38260e1eb5c029c5
SHA512 0afeb505ca1f5b20171b799ac36aa53bcb8c5d588b8f3c966e0b2ed9f7c842b6de5b80d3c6ff1ab2b4929e375d1fee8e74e3be7cc8043d22dd9b806ae8da8806
SSDEEP 49152:A1rlidIyxtWY/U6t16DwCX+1quTzwNVoOpgVrlJ7zts2eOCgSY/ZdF:A1rlidIyFVtOwCX+15EvpGJzW2cY/DF
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
4820	is-E386R.tmp
4804	nuFolders.exe
4728	bvu18g.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	nuFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
4820	is-E386R.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-SHO8A.tmp	is-E386R.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-E386R.tmp
File created	C:\Program Files (x86)\PrintFolders\is-8H0TC.tmp	is-E386R.tmp
File created	C:\Program Files (x86)\PrintFolders\is-318SK.tmp	is-E386R.tmp
File created	C:\Program Files (x86)\PrintFolders\is-0AG7H.tmp	is-E386R.tmp
File created	C:\Program Files (x86)\PrintFolders\is-L2D14.tmp	is-E386R.tmp
File created	C:\Program Files (x86)\PrintFolders\is-QTVHS.tmp	is-E386R.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-E386R.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\nuFolders.exe	is-E386R.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
4308	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4804	nuFolders.exe
4804	nuFolders.exe
4804	nuFolders.exe
4804	nuFolders.exe
4804	nuFolders.exe
4804	nuFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4308	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 8 wrote to memory of 4820	8	file.exe	80
PID 8 wrote to memory of 4820	8	file.exe	80
PID 8 wrote to memory of 4820	8	file.exe	80
PID 4820 wrote to memory of 4804	4820	is-E386R.tmp	81
PID 4820 wrote to memory of 4804	4820	is-E386R.tmp	81
PID 4820 wrote to memory of 4804	4820	is-E386R.tmp	81
PID 4804 wrote to memory of 4728	4804	nuFolders.exe	82
PID 4804 wrote to memory of 4728	4804	nuFolders.exe	82
PID 4804 wrote to memory of 4728	4804	nuFolders.exe	82
PID 4804 wrote to memory of 4012	4804	nuFolders.exe	84
PID 4804 wrote to memory of 4012	4804	nuFolders.exe	84
PID 4804 wrote to memory of 4012	4804	nuFolders.exe	84
PID 4012 wrote to memory of 4308	4012	cmd.exe	86
PID 4012 wrote to memory of 4308	4012	cmd.exe	86
PID 4012 wrote to memory of 4308	4012	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:8
- C:\Users\Admin\AppData\Local\Temp\is-J0UE9.tmp\is-E386R.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-J0UE9.tmp\is-E386R.tmp" /SL4 $8005E "C:\Users\Admin\AppData\Local\Temp\file.exe" 2331379 208896
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4820
- - C:\Program Files (x86)\PrintFolders\nuFolders.exe
    "C:\Program Files (x86)\PrintFolders\nuFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4804
  - - C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\bvu18g.exe
      4⤵
      Executes dropped EXE
      PID:4728
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "nuFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\nuFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4012
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "nuFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4308

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

nuFolders.exe

Path C:\Program Files (x86)\PrintFolders\nuFolders.exe
Size 3.5MB
SHA256 1230f1c9757b368ee7552c5168cf97c57afe0c15471385198af23df3d08d3929
MD5 2e480f063c027c400eab855bb905cff6
SHA1 906cc21fdf6e0b945ccc4d71fdc4ed4b4095afcd
SHA512 b6956df594dec233c4ed04ec29be2646ab694afb7d6177e261edb0d9360ed8328d8ade4912d29560bd18d5d862ca0b419b9309b0a085e554bffcb0fe5b307bdf
SSDEEP 49152:dNsMAsT6yy1hD6Ty6WnaVxq0l93ajJKLvPRTxaOMCH9O:d2MAY6yy1d6TyvnaW0l93atKLRTYaH9O
MD5 SHA1 SHA512 SSDEEP

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nuFolders.exe

Path C:\Program Files (x86)\PrintFolders\nuFolders.exe
Size 3.5MB
SHA256 1230f1c9757b368ee7552c5168cf97c57afe0c15471385198af23df3d08d3929
MD5 2e480f063c027c400eab855bb905cff6
SHA1 906cc21fdf6e0b945ccc4d71fdc4ed4b4095afcd
SHA512 b6956df594dec233c4ed04ec29be2646ab694afb7d6177e261edb0d9360ed8328d8ade4912d29560bd18d5d862ca0b419b9309b0a085e554bffcb0fe5b307bdf
SSDEEP 49152:dNsMAsT6yy1hD6Ty6WnaVxq0l93ajJKLvPRTxaOMCH9O:d2MAY6yy1d6TyvnaW0l93atKLRTYaH9O
MD5 SHA1 SHA512 SSDEEP

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is-E386R.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-J0UE9.tmp\is-E386R.tmp
Size 797KB
SHA256 3bf93457d2543be06c2ee6b1ca376fae57edb9087d72d3972b0b94bdc6bceed6
MD5 91afe004aef0db859b4db8d22a5731b7
SHA1 bae96f4862fdd2f374c2e6fbd70e795aead079b5
SHA512 1e8a8dc13e960be9e00eb0a45a43da860dbf4f1845218813d033e3d3bbe4bf4c93cf0a2c960f03a36841d263b11159bc21a8ac057053173e8c64bb77a8c860dd
SSDEEP 24576:n5NoqWolrP837JzHvA6yknyWFxvMfyxOu:njrP837JzHvA6pnvFxvMCp
MD5 SHA1 SHA512 SSDEEP

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is-E386R.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-J0UE9.tmp\is-E386R.tmp
Size 797KB
SHA256 3bf93457d2543be06c2ee6b1ca376fae57edb9087d72d3972b0b94bdc6bceed6
MD5 91afe004aef0db859b4db8d22a5731b7
SHA1 bae96f4862fdd2f374c2e6fbd70e795aead079b5
SHA512 1e8a8dc13e960be9e00eb0a45a43da860dbf4f1845218813d033e3d3bbe4bf4c93cf0a2c960f03a36841d263b11159bc21a8ac057053173e8c64bb77a8c860dd
SSDEEP 24576:n5NoqWolrP837JzHvA6yknyWFxvMfyxOu:njrP837JzHvA6pnvFxvMCp
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-VA8HH.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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bvu18g.exe

Path C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\bvu18g.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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bvu18g.exe

Path C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\bvu18g.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/8-132-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/8-156-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/8-137-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/4804-142-0x0000000000400000-0x000000000158A000-memory.dmp

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memory/4804-144-0x0000000000400000-0x000000000158A000-memory.dmp

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memory/4804-148-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4804-152-0x0000000000400000-0x000000000158A000-memory.dmp

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memory/4804-143-0x0000000000400000-0x000000000158A000-memory.dmp

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memory/4804-155-0x0000000000400000-0x000000000158A000-memory.dmp

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