juko | 9d8532c42a36e47927eda619f8757c33a20bf8abbc9a3e16508fa633c22dd2b2

General

Target
2026-08-31_0c97df7043a5a23c580544bc29adf8f6_elex_wannacry.exe
Size 64KB
Sample260831-269tkazfpd
SHA256 9d8532c42a36e47927eda619f8757c33a20bf8abbc9a3e16508fa633c22dd2b2
MD5 0c97df7043a5a23c580544bc29adf8f6
SHA1 311ee1b826d2f3d649028d372f2012c87ffe8e43
SHA512 b514d3cedb86a17a56d1bcb32596a305874f77c2ca8d746de48aea6bdfa7c800dcfcd436710c68ebb2c949b40299e12a86a318905e4db0401a7bc18103260c22
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDC:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8a
TLSH
T12A5338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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/0x000b000000019cc9-4.dat	family_juko
behavioral2/files/0x000e00000001c52a-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4832	WINWORD.exe
4272	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-1-5-21-1738198120-2966725515-3980530802-1000\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
3336	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-31_0c97df7043a5a23c580544bc29adf8f6_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

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
3336	cmd.exe
6008	PING.EXE
1560	PING.EXE
2188	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6008	PING.EXE
1560	PING.EXE
2188	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3588 wrote to memory of 4832	3588	2026-08-31_0c97df7043a5a23c580544bc29adf8f6_elex_wannacry.exe	90
PID 4832 wrote to memory of 3336	4832	WINWORD.exe	91
PID 3336 wrote to memory of 6008	3336	cmd.exe	93
PID 3336 wrote to memory of 1560	3336	cmd.exe	94
PID 3336 wrote to memory of 2188	3336	cmd.exe	95
PID 3336 wrote to memory of 4272	3336	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-31_0c97df7043a5a23c580544bc29adf8f6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_0c97df7043a5a23c580544bc29adf8f6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3588
- 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:4832
- - 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\00001A11" 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:3336
  - - 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:6008
  - - 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:1560
  - - 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:2188
  - - 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:4272

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

00001A11

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001A11
Size 64KB
SHA256 3ec356cb40062a6353946b364a075c68e039f56ac3da315c98002cd9c0b412b7
MD5 20a693aab6243abb5743c867ea4618ee
SHA1 1f16e793590002f2b6bd5f406447b6be2e9849d1
SHA512 9f85d2f0e74543edeb16d3b87f8c3373f61c232c1d2ee560f0752d07247d3d6ef56248e214743b94e4b1871645a29bff63c67477083a73dbf569091292e9b8d5
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDU:t2Ly2Kerc64CiGImClOyqlvGdnNJfG88
TLSH
T1195338173BE554C2E1E606706DB68F78847BFC700A23D51AB780720E1C75E62DE31BAA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 9d8532c42a36e47927eda619f8757c33a20bf8abbc9a3e16508fa633c22dd2b2
MD5 0c97df7043a5a23c580544bc29adf8f6
SHA1 311ee1b826d2f3d649028d372f2012c87ffe8e43
SHA512 b514d3cedb86a17a56d1bcb32596a305874f77c2ca8d746de48aea6bdfa7c800dcfcd436710c68ebb2c949b40299e12a86a318905e4db0401a7bc18103260c22
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDC:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8a
TLSH
T12A5338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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