nymaim | 867bf6803e12f01773dbb65b1d7b5c60110ffd0e74f13cdcd7454db16915e9bf

Analysis

max time kernel
91s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
16/12/2022, 04:32

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General

Target
file.exe
Size 2.3MB
Sample221216-e5yzcaeb33
SHA256 867bf6803e12f01773dbb65b1d7b5c60110ffd0e74f13cdcd7454db16915e9bf
MD5 d691da7b42e3b62bcaad40f977f074d8
SHA1 301c295887c34f8177e9851140fa868842e1ab30
SHA512 1003c3db3325c274a03510e68eac10479288ea0be4beda199cc1a3cfe774c10e11b8164b6e53d3c34fdf71a51f445f4a0316104e0bbb9ad5517ee00647666774
SSDEEP 49152:kpFIF1Zc1mzd7m3i9uzS+YgJP+Ewu88Lg8esb7ce/zeOCgSY/imU:kp6dc8pDEzN10EHDg8Bn7cY/imU
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
4324	is-S8612.tmp
3020	oaFolders.exe
1288	3tEpjt0yYEP1.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-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	oaFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
4324	is-S8612.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-URDK8.tmp	is-S8612.tmp
File created	C:\Program Files (x86)\PrintFolders\is-RBB90.tmp	is-S8612.tmp
File created	C:\Program Files (x86)\PrintFolders\is-SN3OT.tmp	is-S8612.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-S8612.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\oaFolders.exe	is-S8612.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-S8612.tmp
File created	C:\Program Files (x86)\PrintFolders\is-EMACL.tmp	is-S8612.tmp
File created	C:\Program Files (x86)\PrintFolders\is-4P8MD.tmp	is-S8612.tmp
File created	C:\Program Files (x86)\PrintFolders\is-N8EEF.tmp	is-S8612.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
4456	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3020	oaFolders.exe
3020	oaFolders.exe
3020	oaFolders.exe
3020	oaFolders.exe
3020	oaFolders.exe
3020	oaFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4456	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4412 wrote to memory of 4324	4412	file.exe	81
PID 4412 wrote to memory of 4324	4412	file.exe	81
PID 4412 wrote to memory of 4324	4412	file.exe	81
PID 4324 wrote to memory of 3020	4324	is-S8612.tmp	82
PID 4324 wrote to memory of 3020	4324	is-S8612.tmp	82
PID 4324 wrote to memory of 3020	4324	is-S8612.tmp	82
PID 3020 wrote to memory of 1288	3020	oaFolders.exe	85
PID 3020 wrote to memory of 1288	3020	oaFolders.exe	85
PID 3020 wrote to memory of 1288	3020	oaFolders.exe	85
PID 3020 wrote to memory of 1956	3020	oaFolders.exe	91
PID 3020 wrote to memory of 1956	3020	oaFolders.exe	91
PID 3020 wrote to memory of 1956	3020	oaFolders.exe	91
PID 1956 wrote to memory of 4456	1956	cmd.exe	93
PID 1956 wrote to memory of 4456	1956	cmd.exe	93
PID 1956 wrote to memory of 4456	1956	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4412
- C:\Users\Admin\AppData\Local\Temp\is-QGG9K.tmp\is-S8612.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-QGG9K.tmp\is-S8612.tmp" /SL4 $8006C "C:\Users\Admin\AppData\Local\Temp\file.exe" 2156999 208896
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4324
- - C:\Program Files (x86)\PrintFolders\oaFolders.exe
    "C:\Program Files (x86)\PrintFolders\oaFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:3020
  - - C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\3tEpjt0yYEP1.exe
      4⤵
      Executes dropped EXE
      PID:1288
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "oaFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\oaFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1956
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "oaFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4456

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

oaFolders.exe

Path C:\Program Files (x86)\PrintFolders\oaFolders.exe
Size 3.4MB
SHA256 84f8ba7b03ff27c570f0080b811872bd8c8120f1b5d83c2ad67e7b274293af58
MD5 6af789cdbd65aae8c14aba91f55473ce
SHA1 630058a88484f8606b4cb8207ed5fc6a6fe8ef84
SHA512 7dc4c45c3db1403eb118265ebb07f2a5ef664cba86c87ca6229393baa9eb02a22083854efaf28269531e76fdbb2cccc367e86132fca25881b68f693587177894
SSDEEP 98304:8p10pH+um8KIfIkzob0bcUKKg5jAU5gA2Oo+9NJa:oa9fIMu9Va
MD5 SHA1 SHA512 SSDEEP

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oaFolders.exe

Path C:\Program Files (x86)\PrintFolders\oaFolders.exe
Size 3.4MB
SHA256 84f8ba7b03ff27c570f0080b811872bd8c8120f1b5d83c2ad67e7b274293af58
MD5 6af789cdbd65aae8c14aba91f55473ce
SHA1 630058a88484f8606b4cb8207ed5fc6a6fe8ef84
SHA512 7dc4c45c3db1403eb118265ebb07f2a5ef664cba86c87ca6229393baa9eb02a22083854efaf28269531e76fdbb2cccc367e86132fca25881b68f693587177894
SSDEEP 98304:8p10pH+um8KIfIkzob0bcUKKg5jAU5gA2Oo+9NJa:oa9fIMu9Va
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-IU4NP.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-S8612.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-QGG9K.tmp\is-S8612.tmp
Size 797KB
SHA256 d0df1c119b09c7d2d6973428d794379d2366077185206e4787d76a0c35267d96
MD5 33067bd40abffd83261cc0aff0298b85
SHA1 f492c02df1ef097c24d2e93d3a80fa521e3d767e
SHA512 89b014df03a157b565009e96ec9a4520fc12412404ed5420b5a540bb5aca6a60352996c91e5b81c235f93dd1a5412fb79a84b30038913f103a78249384e8f648
SSDEEP 12288:Bh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvyzxxOu:n5NoqWolrP837JzHvA6yknyWFxvuxxOu
MD5 SHA1 SHA512 SSDEEP

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is-S8612.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-QGG9K.tmp\is-S8612.tmp
Size 797KB
SHA256 d0df1c119b09c7d2d6973428d794379d2366077185206e4787d76a0c35267d96
MD5 33067bd40abffd83261cc0aff0298b85
SHA1 f492c02df1ef097c24d2e93d3a80fa521e3d767e
SHA512 89b014df03a157b565009e96ec9a4520fc12412404ed5420b5a540bb5aca6a60352996c91e5b81c235f93dd1a5412fb79a84b30038913f103a78249384e8f648
SSDEEP 12288:Bh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvyzxxOu:n5NoqWolrP837JzHvA6yknyWFxvuxxOu
MD5 SHA1 SHA512 SSDEEP

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3tEpjt0yYEP1.exe

Path C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\3tEpjt0yYEP1.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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3tEpjt0yYEP1.exe

Path C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\3tEpjt0yYEP1.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/3020-151-0x0000000000400000-0x000000000156E000-memory.dmp

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memory/3020-143-0x0000000000400000-0x000000000156E000-memory.dmp

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memory/3020-142-0x0000000000400000-0x000000000156E000-memory.dmp

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memory/3020-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/3020-154-0x0000000000400000-0x000000000156E000-memory.dmp

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memory/4412-138-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/4412-132-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/4412-155-0x0000000000400000-0x0000000000439000-memory.dmp

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