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
behavioral1/files/0x00100000000243e0-4.dat	family_juko
behavioral1/files/0x0009000000024492-12.dat	family_juko

Checks computer location settings 2 TTPs 2 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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-08-31_0c97df7043a5a23c580544bc29adf8f6_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3964	WINWORD.exe
3416	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-1-5-21-2937465464-4167303362-2236413517-1000\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
1676	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	2026-08-31_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
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
1676	cmd.exe
4956	PING.EXE
3444	PING.EXE
2064	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2064	PING.EXE
4956	PING.EXE
3444	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3928 wrote to memory of 3964	3928	2026-08-31_0c97df7043a5a23c580544bc29adf8f6_elex_wannacry.exe	84
PID 3964 wrote to memory of 1676	3964	WINWORD.exe	85
PID 1676 wrote to memory of 4956	1676	cmd.exe	87
PID 1676 wrote to memory of 3444	1676	cmd.exe	88
PID 1676 wrote to memory of 2064	1676	cmd.exe	89
PID 1676 wrote to memory of 3416	1676	cmd.exe	92

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3928
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3964
- - 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\00000A01" 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:1676
  - - 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:4956
  - - 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:3444
  - - 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:2064
  - - 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:3416

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00000A01

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000A01
Size 64KB
SHA256 6276172fb33680f63334c9bec8f3ae82f256cd4fef03e0f9e848f2308f4ebe3f
MD5 94804ea6d4b9fce44cb4f57d291aa4ae
SHA1 d04220402102a855a561a2b73bb64e04e8895ef6
SHA512 0ae4ef1cab1bd981493122aea104099748d4efa9863150389b048d6140175ac5e881eb23616e7b253a61a45585d88b1cb2e9688c78825bcef0348ac53caf550b
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDv:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8n
TLSH
T12A5338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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