nymaim | ca133be8548606a2caf2e4ba5851d9b3f072bc92b5da032cc09edddf8bc11ee1

Analysis

max time kernel
144s
max time network
152s
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, 07:17

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General

Target
file.exe
Size 2.5MB
Sample221216-h4dhssec84
SHA256 ca133be8548606a2caf2e4ba5851d9b3f072bc92b5da032cc09edddf8bc11ee1
MD5 f9fd72551ca9e722decf9951baeaa3de
SHA1 f6a711e0264f90746030a913d0d6185ad4cd09cd
SHA512 9c3be440f53f06d968720a5cf8f66a1f4a93eb4471c75b3436af703dfc25a80b49fdf5550e61a356737a6c1ff3a97a3f2604447466fc880e792e5456450d534b
SSDEEP 49152:opgBRC2jVLYveJoS+/Fwg79ZxhiWs+O9B5ieOCgSY/imP:opgTC2hYvm+/FBfhiGOccY/imP
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
4680	is-JT7T4.tmp
3336	oaFolders.exe
4596	BtXPqleFc.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	oaFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
4680	is-JT7T4.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-P7LLL.tmp	is-JT7T4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-PIU1L.tmp	is-JT7T4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-OH9N2.tmp	is-JT7T4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-9ATIH.tmp	is-JT7T4.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-JT7T4.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\oaFolders.exe	is-JT7T4.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-JT7T4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-NO7UM.tmp	is-JT7T4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-932S1.tmp	is-JT7T4.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
2768	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3336	oaFolders.exe
3336	oaFolders.exe
3336	oaFolders.exe
3336	oaFolders.exe
3336	oaFolders.exe
3336	oaFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2768	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4724 wrote to memory of 4680	4724	file.exe	82
PID 4724 wrote to memory of 4680	4724	file.exe	82
PID 4724 wrote to memory of 4680	4724	file.exe	82
PID 4680 wrote to memory of 3336	4680	is-JT7T4.tmp	83
PID 4680 wrote to memory of 3336	4680	is-JT7T4.tmp	83
PID 4680 wrote to memory of 3336	4680	is-JT7T4.tmp	83
PID 3336 wrote to memory of 4596	3336	oaFolders.exe	84
PID 3336 wrote to memory of 4596	3336	oaFolders.exe	84
PID 3336 wrote to memory of 4596	3336	oaFolders.exe	84
PID 3336 wrote to memory of 4544	3336	oaFolders.exe	92
PID 3336 wrote to memory of 4544	3336	oaFolders.exe	92
PID 3336 wrote to memory of 4544	3336	oaFolders.exe	92
PID 4544 wrote to memory of 2768	4544	cmd.exe	94
PID 4544 wrote to memory of 2768	4544	cmd.exe	94
PID 4544 wrote to memory of 2768	4544	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4724
- C:\Users\Admin\AppData\Local\Temp\is-5JUUH.tmp\is-JT7T4.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-5JUUH.tmp\is-JT7T4.tmp" /SL4 $9006C "C:\Users\Admin\AppData\Local\Temp\file.exe" 2301364 208896
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4680
- - 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:3336
  - - C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\BtXPqleFc.exe
      4⤵
      Executes dropped EXE
      PID:4596
  - - 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:4544
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "oaFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2768

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 3.6MB
SHA256 9f32f4f85d00c16d669c872f4bd037ad665f9d7f6ca9caa3da38a1137bb72bc9
MD5 cc835ddef2f61743285d7e29b0153570
SHA1 9519618819f9348478c5c879812afd7743568345
SHA512 428d8219a97705148129bbba044a619c8fa74106588ce1cd620f8cbc5b2ef18debbf434aada02845b0733e58533e6f3e90c423bbbefced0dd1ccb5d34b58d74e
SSDEEP 98304:fz7ZnEJ3nq+IGfIY7NIcDggl8b9DDjbPs60KqJ:bWfIYs7kTJ
MD5 SHA1 SHA512 SSDEEP

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oaFolders.exe

Path C:\Program Files (x86)\PrintFolders\oaFolders.exe
Size 3.6MB
SHA256 9f32f4f85d00c16d669c872f4bd037ad665f9d7f6ca9caa3da38a1137bb72bc9
MD5 cc835ddef2f61743285d7e29b0153570
SHA1 9519618819f9348478c5c879812afd7743568345
SHA512 428d8219a97705148129bbba044a619c8fa74106588ce1cd620f8cbc5b2ef18debbf434aada02845b0733e58533e6f3e90c423bbbefced0dd1ccb5d34b58d74e
SSDEEP 98304:fz7ZnEJ3nq+IGfIY7NIcDggl8b9DDjbPs60KqJ:bWfIYs7kTJ
MD5 SHA1 SHA512 SSDEEP

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is-JT7T4.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-5JUUH.tmp\is-JT7T4.tmp
Size 797KB
SHA256 d0df1c119b09c7d2d6973428d794379d2366077185206e4787d76a0c35267d96
MD5 33067bd40abffd83261cc0aff0298b85
SHA1 f492c02df1ef097c24d2e93d3a80fa521e3d767e
SHA512 89b014df03a157b565009e96ec9a4520fc12412404ed5420b5a540bb5aca6a60352996c91e5b81c235f93dd1a5412fb79a84b30038913f103a78249384e8f648
SSDEEP 12288:Bh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvyzxxOu:n5NoqWolrP837JzHvA6yknyWFxvuxxOu
MD5 SHA1 SHA512 SSDEEP

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is-JT7T4.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-5JUUH.tmp\is-JT7T4.tmp
Size 797KB
SHA256 d0df1c119b09c7d2d6973428d794379d2366077185206e4787d76a0c35267d96
MD5 33067bd40abffd83261cc0aff0298b85
SHA1 f492c02df1ef097c24d2e93d3a80fa521e3d767e
SHA512 89b014df03a157b565009e96ec9a4520fc12412404ed5420b5a540bb5aca6a60352996c91e5b81c235f93dd1a5412fb79a84b30038913f103a78249384e8f648
SSDEEP 12288:Bh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvyzxxOu:n5NoqWolrP837JzHvA6yknyWFxvuxxOu
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-DC3OI.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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BtXPqleFc.exe

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

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\BtXPqleFc.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/3336-148-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/3336-142-0x0000000000400000-0x00000000015A0000-memory.dmp

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memory/3336-143-0x0000000000400000-0x00000000015A0000-memory.dmp

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memory/3336-144-0x0000000000400000-0x00000000015A0000-memory.dmp

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memory/3336-152-0x0000000000400000-0x00000000015A0000-memory.dmp

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memory/3336-154-0x0000000000400000-0x00000000015A0000-memory.dmp

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memory/4724-138-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/4724-132-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/4724-155-0x0000000000400000-0x0000000000439000-memory.dmp

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