nymaim | b8dae8f3a780f035fce473a31937dc556e95bbeb1055b2d02a09c0dd893fe0f9

General

Target

file.exe
Size

2.3MB
MD5

0c2e8d74a5db0d180de6c674035dd020
SHA1

2c5ee63431e5ed06096617bdc57faf2202bdd733
SHA256

b8dae8f3a780f035fce473a31937dc556e95bbeb1055b2d02a09c0dd893fe0f9
SHA512

c22a1a413bfed0935aba6bb50e997a553c7bcc11b9bc148ec4397ac65afb8f0a2052b84376a22c317e2151c9db74c168f07dc1ed05eddfe15ea89c4030a38214
SSDEEP

49152:Epj/5gE953wNpKlExRt1mLvGzfmQaM9eOCgSY/imj:EpKE/AfKaxRuTGrmPM9cY/imj

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

C2

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
3972	is-C0AF8.tmp
4868	oaFolders.exe
3592	BoUaBaXXtAqX0.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	oaFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
3972	is-C0AF8.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-1UL7M.tmp	is-C0AF8.tmp
File created	C:\Program Files (x86)\PrintFolders\is-UEFCA.tmp	is-C0AF8.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-C0AF8.tmp
File created	C:\Program Files (x86)\PrintFolders\is-MEGKI.tmp	is-C0AF8.tmp
File created	C:\Program Files (x86)\PrintFolders\is-M8OJI.tmp	is-C0AF8.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\oaFolders.exe	is-C0AF8.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-C0AF8.tmp
File created	C:\Program Files (x86)\PrintFolders\is-1DT11.tmp	is-C0AF8.tmp
File created	C:\Program Files (x86)\PrintFolders\is-3CL0I.tmp	is-C0AF8.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
4572	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4868	oaFolders.exe
4868	oaFolders.exe
4868	oaFolders.exe
4868	oaFolders.exe
4868	oaFolders.exe
4868	oaFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4572	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1652 wrote to memory of 3972	1652	file.exe	80
PID 1652 wrote to memory of 3972	1652	file.exe	80
PID 1652 wrote to memory of 3972	1652	file.exe	80
PID 3972 wrote to memory of 4868	3972	is-C0AF8.tmp	81
PID 3972 wrote to memory of 4868	3972	is-C0AF8.tmp	81
PID 3972 wrote to memory of 4868	3972	is-C0AF8.tmp	81
PID 4868 wrote to memory of 3592	4868	oaFolders.exe	82
PID 4868 wrote to memory of 3592	4868	oaFolders.exe	82
PID 4868 wrote to memory of 3592	4868	oaFolders.exe	82
PID 4868 wrote to memory of 544	4868	oaFolders.exe	90
PID 4868 wrote to memory of 544	4868	oaFolders.exe	90
PID 4868 wrote to memory of 544	4868	oaFolders.exe	90
PID 544 wrote to memory of 4572	544	cmd.exe	92
PID 544 wrote to memory of 4572	544	cmd.exe	92
PID 544 wrote to memory of 4572	544	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1652
- C:\Users\Admin\AppData\Local\Temp\is-5SILN.tmp\is-C0AF8.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-5SILN.tmp\is-C0AF8.tmp" /SL4 $8004A "C:\Users\Admin\AppData\Local\Temp\file.exe" 2110245 208896
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:3972
- - 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:4868
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\BoUaBaXXtAqX0.exe
      4⤵
      Executes dropped EXE
      PID:3592
  - - 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:544
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "oaFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4572

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files (x86)\PrintFolders\oaFolders.exe

Filesize
3.4MB

MD5
1fd4469489b88cee95d335dbe360925a

SHA1
dedf7b7a6b5a34e04cacae988eba45177b49ba2d

SHA256
37cb3189acf157c391fc3c09cd00c60bece346285017279690dd1c657dbdd157

SHA512
818f225799399b5c61a6066f3d6e672ae30e4ae334674c22bdc0fea944b3b1a007f111ae5c119a11db3dc2a19c82c1e131b15be2400a6649549e74647ec03869

Download Submit
C:\Program Files (x86)\PrintFolders\oaFolders.exe

Filesize
3.4MB

MD5
1fd4469489b88cee95d335dbe360925a

SHA1
dedf7b7a6b5a34e04cacae988eba45177b49ba2d

SHA256
37cb3189acf157c391fc3c09cd00c60bece346285017279690dd1c657dbdd157

SHA512
818f225799399b5c61a6066f3d6e672ae30e4ae334674c22bdc0fea944b3b1a007f111ae5c119a11db3dc2a19c82c1e131b15be2400a6649549e74647ec03869

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-5SILN.tmp\is-C0AF8.tmp

Filesize
797KB

MD5
33067bd40abffd83261cc0aff0298b85

SHA1
f492c02df1ef097c24d2e93d3a80fa521e3d767e

SHA256
d0df1c119b09c7d2d6973428d794379d2366077185206e4787d76a0c35267d96

SHA512
89b014df03a157b565009e96ec9a4520fc12412404ed5420b5a540bb5aca6a60352996c91e5b81c235f93dd1a5412fb79a84b30038913f103a78249384e8f648

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-5SILN.tmp\is-C0AF8.tmp

Filesize
797KB

MD5
33067bd40abffd83261cc0aff0298b85

SHA1
f492c02df1ef097c24d2e93d3a80fa521e3d767e

SHA256
d0df1c119b09c7d2d6973428d794379d2366077185206e4787d76a0c35267d96

SHA512
89b014df03a157b565009e96ec9a4520fc12412404ed5420b5a540bb5aca6a60352996c91e5b81c235f93dd1a5412fb79a84b30038913f103a78249384e8f648

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-DOVNP.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\BoUaBaXXtAqX0.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\BoUaBaXXtAqX0.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/1652-155-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/1652-132-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/1652-137-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/4868-143-0x0000000000400000-0x000000000156E000-memory.dmp

Filesize
17.4MB

Download
memory/4868-151-0x0000000000400000-0x000000000156E000-memory.dmp

Filesize
17.4MB

Download
memory/4868-147-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/4868-142-0x0000000000400000-0x000000000156E000-memory.dmp

Filesize
17.4MB

Download
memory/4868-154-0x0000000000400000-0x000000000156E000-memory.dmp

Filesize
17.4MB

Download

Analysis

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