nymaim | 9f73fc87cb0aa83f97e160c92bbf1e3e542a756eb0a06082d6f1143e12a1e2d2

Analysis

max time kernel
127s
max time network
129s
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, 15:02

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General

Target
file.exe
Size 2.3MB
Sample221216-sefa7seh68
SHA256 9f73fc87cb0aa83f97e160c92bbf1e3e542a756eb0a06082d6f1143e12a1e2d2
MD5 2c0daf6e1198c96926977c19cefb78a1
SHA1 d479fbdad3e8caea8973abc4fb6516736d077658
SHA512 67a5541e56fbf6a68841e8e1434568cc237350fa1197ac7ca1b2ff6a365107968cec8b17eb9ac6b8e0e2996a7d07d6cb10995336c605b9558911872832edf323
SSDEEP 49152:0pm6yyzO6brXgn/ElJ4idCrSW3EVfpMBQ9TPyeoT6enxKBTlqeOCgSY/imN:0pm31L/s4iUSDh+qTPItxKlEcY/imN
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
4956	is-6O500.tmp
4400	oaFolders.exe
4444	1EpJXA0uCCu5.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
4956	is-6O500.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-6O500.tmp
File created	C:\Program Files (x86)\PrintFolders\is-A20IU.tmp	is-6O500.tmp
File created	C:\Program Files (x86)\PrintFolders\is-4GCAJ.tmp	is-6O500.tmp
File created	C:\Program Files (x86)\PrintFolders\is-7TGP7.tmp	is-6O500.tmp
File created	C:\Program Files (x86)\PrintFolders\is-QPVRH.tmp	is-6O500.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-6O500.tmp
File created	C:\Program Files (x86)\PrintFolders\is-8FF59.tmp	is-6O500.tmp
File created	C:\Program Files (x86)\PrintFolders\is-V4NDB.tmp	is-6O500.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\oaFolders.exe	is-6O500.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
1444	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4400	oaFolders.exe
4400	oaFolders.exe
4400	oaFolders.exe
4400	oaFolders.exe
4400	oaFolders.exe
4400	oaFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1444	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4888 wrote to memory of 4956	4888	file.exe	81
PID 4888 wrote to memory of 4956	4888	file.exe	81
PID 4888 wrote to memory of 4956	4888	file.exe	81
PID 4956 wrote to memory of 4400	4956	is-6O500.tmp	82
PID 4956 wrote to memory of 4400	4956	is-6O500.tmp	82
PID 4956 wrote to memory of 4400	4956	is-6O500.tmp	82
PID 4400 wrote to memory of 4444	4400	oaFolders.exe	86
PID 4400 wrote to memory of 4444	4400	oaFolders.exe	86
PID 4400 wrote to memory of 4444	4400	oaFolders.exe	86
PID 4400 wrote to memory of 3164	4400	oaFolders.exe	93
PID 4400 wrote to memory of 3164	4400	oaFolders.exe	93
PID 4400 wrote to memory of 3164	4400	oaFolders.exe	93
PID 3164 wrote to memory of 1444	3164	cmd.exe	95
PID 3164 wrote to memory of 1444	3164	cmd.exe	95
PID 3164 wrote to memory of 1444	3164	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4888
- C:\Users\Admin\AppData\Local\Temp\is-A9DU7.tmp\is-6O500.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-A9DU7.tmp\is-6O500.tmp" /SL4 $B0182 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2180836 208896
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4956
- - 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:4400
  - - C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\1EpJXA0uCCu5.exe
      4⤵
      Executes dropped EXE
      PID:4444
  - - 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:3164
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "oaFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1444

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 3.5MB
SHA256 7450a9c2fb82ebd20544f6f5b8ceec5a330e2fcfb2ae662a66f9e6b6db3654ef
MD5 7830ce5e305c56c64403eba8a8a672e9
SHA1 aca924e1f87bcf965b1bae5911e4243b8c7a9673
SHA512 43e3785c5eabcfec391a56933205613a7ed27a58e627622d6180bf0f9a0522a50123f04518e0ac6fce9f5de496da0f03c356723e48827756c8e23d6241c248b3
SSDEEP 98304:laCMBUFjDwfIEqH4ww938BtVll35SCSEh:JkfIlt
MD5 SHA1 SHA512 SSDEEP

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oaFolders.exe

Path C:\Program Files (x86)\PrintFolders\oaFolders.exe
Size 3.5MB
SHA256 7450a9c2fb82ebd20544f6f5b8ceec5a330e2fcfb2ae662a66f9e6b6db3654ef
MD5 7830ce5e305c56c64403eba8a8a672e9
SHA1 aca924e1f87bcf965b1bae5911e4243b8c7a9673
SHA512 43e3785c5eabcfec391a56933205613a7ed27a58e627622d6180bf0f9a0522a50123f04518e0ac6fce9f5de496da0f03c356723e48827756c8e23d6241c248b3
SSDEEP 98304:laCMBUFjDwfIEqH4ww938BtVll35SCSEh:JkfIlt
MD5 SHA1 SHA512 SSDEEP

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is-6O500.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-A9DU7.tmp\is-6O500.tmp
Size 797KB
SHA256 d0df1c119b09c7d2d6973428d794379d2366077185206e4787d76a0c35267d96
MD5 33067bd40abffd83261cc0aff0298b85
SHA1 f492c02df1ef097c24d2e93d3a80fa521e3d767e
SHA512 89b014df03a157b565009e96ec9a4520fc12412404ed5420b5a540bb5aca6a60352996c91e5b81c235f93dd1a5412fb79a84b30038913f103a78249384e8f648
SSDEEP 12288:Bh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvyzxxOu:n5NoqWolrP837JzHvA6yknyWFxvuxxOu
MD5 SHA1 SHA512 SSDEEP

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is-6O500.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-A9DU7.tmp\is-6O500.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-VKB3L.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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1EpJXA0uCCu5.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\1EpJXA0uCCu5.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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1EpJXA0uCCu5.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\1EpJXA0uCCu5.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/4400-143-0x0000000000400000-0x0000000001588000-memory.dmp

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memory/4400-142-0x0000000000400000-0x0000000001588000-memory.dmp

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memory/4400-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4400-151-0x0000000000400000-0x0000000001588000-memory.dmp

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memory/4400-154-0x0000000000400000-0x0000000001588000-memory.dmp

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memory/4888-132-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/4888-137-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/4888-155-0x0000000000400000-0x0000000000439000-memory.dmp

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