juko | 012c9d44fd26505057830c70fea6f5298b6308e0b48a598297c0473c74114df7

General

Target
2026-08-24_5f23f4fa995e055b89d2251d598c72d1_elex_wannacry.exe
Size 64KB
Sample260825-pgmlhssaja
SHA256 012c9d44fd26505057830c70fea6f5298b6308e0b48a598297c0473c74114df7
MD5 5f23f4fa995e055b89d2251d598c72d1
SHA1 deade942f1f769a792fd0acb06bed4d58c88e269
SHA512 10dab48eeee91ca4a7047a3fa113ec9286d99a3cbb0cfbe85c654bc4d44ca439eadeb8a99316d31b6485605c171c0622dc7d0fb1d502f92a63caa218b4115fa5
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u9:sLy2Kerc64CiGIm8so289
TLSH
T1EC535C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 2 IoCs

resource	yara_rule
behavioral2/files/0x0009000000016cdf-4.dat	family_juko
behavioral2/files/0x000e00000001c589-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3884	WINWORD.exe
4904	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-552508041-2681165170-3229858294-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4504	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-24_5f23f4fa995e055b89d2251d598c72d1_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4504	cmd.exe
2784	PING.EXE
2556	PING.EXE
2152	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2784	PING.EXE
2556	PING.EXE
2152	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1856 wrote to memory of 3884	1856	2026-08-24_5f23f4fa995e055b89d2251d598c72d1_elex_wannacry.exe	89
PID 3884 wrote to memory of 4504	3884	WINWORD.exe	90
PID 4504 wrote to memory of 2784	4504	cmd.exe	92
PID 4504 wrote to memory of 2556	4504	cmd.exe	93
PID 4504 wrote to memory of 2152	4504	cmd.exe	94
PID 4504 wrote to memory of 4904	4504	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-24_5f23f4fa995e055b89d2251d598c72d1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-24_5f23f4fa995e055b89d2251d598c72d1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1856
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3884
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00000013" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4504
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:2784
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:2556
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:2152
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:4904

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00000013

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000013
Size 64KB
SHA256 bd4c11c8b3be928d9f0582b7f8aa7d91777cbb72687ca3db40aae8f158b204b0
MD5 34704115f1ec50041ce4aae443258ad9
SHA1 db7548c86347780e61616095400c8e1b9242d34d
SHA512 086549b5bae35c2e96987f656d41349c24f89d1ca5afad02fbbd24798c8d1218f4bcc58b22c7182d8f8496d79fcc6bf82cc196a1e80d5c7f59847e6b86432985
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u9:sLy2Kerc64CiGIm8so289
TLSH
T10C535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 012c9d44fd26505057830c70fea6f5298b6308e0b48a598297c0473c74114df7
MD5 5f23f4fa995e055b89d2251d598c72d1
SHA1 deade942f1f769a792fd0acb06bed4d58c88e269
SHA512 10dab48eeee91ca4a7047a3fa113ec9286d99a3cbb0cfbe85c654bc4d44ca439eadeb8a99316d31b6485605c171c0622dc7d0fb1d502f92a63caa218b4115fa5
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u9:sLy2Kerc64CiGIm8so289
TLSH
T1EC535C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads