juko | 91666f09490b9620d93922887aa10f2520748dc803f4bbb72de9cb24a325330d

General

Target
2026-11-01_cca7fb74ace9dd3ff33fd186c1a70540_elex_wannacry.exe
Size 86KB
Sample261102-keze3sty5m
SHA256 91666f09490b9620d93922887aa10f2520748dc803f4bbb72de9cb24a325330d
MD5 cca7fb74ace9dd3ff33fd186c1a70540
SHA1 1ac5f46346c367818688df9bd09cd7533b4278aa
SHA512 b0b874be02957faeeba93293781961e44a168bf00f7db7c4fb609d9315ea0fceea2102b95adafecf21473e3ee422c277a37cf9b41298be0e2d8016ee26764d57
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwp+:vLy2Kerc64CiGImMPu/ouEQkwp+
TLSH
T13283C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
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 7 IoCs

resource	yara_rule
behavioral2/memory/3816-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000700000001b867-4.dat	family_juko
behavioral2/memory/3816-10-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/528-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c593-13.dat	family_juko
behavioral2/memory/5240-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5240-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
528	WINWORD.exe
5240	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-1-5-21-650287814-2715975232-1279715623-1000\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
5968	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-01_cca7fb74ace9dd3ff33fd186c1a70540_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

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
5680	PING.EXE
1472	PING.EXE
5968	cmd.exe
5600	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5600	PING.EXE
5680	PING.EXE
1472	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3816 wrote to memory of 528	3816	2026-11-01_cca7fb74ace9dd3ff33fd186c1a70540_elex_wannacry.exe	89
PID 528 wrote to memory of 5968	528	WINWORD.exe	90
PID 5968 wrote to memory of 5600	5968	cmd.exe	92
PID 5968 wrote to memory of 5680	5968	cmd.exe	93
PID 5968 wrote to memory of 1472	5968	cmd.exe	94
PID 5968 wrote to memory of 5240	5968	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-11-01_cca7fb74ace9dd3ff33fd186c1a70540_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-01_cca7fb74ace9dd3ff33fd186c1a70540_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3816
- 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:528
- - 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\00005969" 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:5968
  - - 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:5600
  - - 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:5680
  - - 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:1472
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:5240

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00005969

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005969
Size 86KB
SHA256 7ca6981e404741aded2a331800ea2415b9d2538c200e4ee28e4b29c07d405f02
MD5 be9d3577a18a0702a634ebf132a75907
SHA1 468ef7909f3f9269e8455741bfd4a844f7cf9aa4
SHA512 b06effc4fca0e7f89e0409a0739a97b09e0d86eb385b7f883ef4aa098c7603c051f3f9e50938950a0c7a9763f4cc2ddff1d83c72a41b39889d3840129cdcb25a
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwp/:vLy2Kerc64CiGImMPu/ouEQkwp/
TLSH
T13D83C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 86KB
SHA256 91666f09490b9620d93922887aa10f2520748dc803f4bbb72de9cb24a325330d
MD5 cca7fb74ace9dd3ff33fd186c1a70540
SHA1 1ac5f46346c367818688df9bd09cd7533b4278aa
SHA512 b0b874be02957faeeba93293781961e44a168bf00f7db7c4fb609d9315ea0fceea2102b95adafecf21473e3ee422c277a37cf9b41298be0e2d8016ee26764d57
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwp+:vLy2Kerc64CiGImMPu/ouEQkwp+
TLSH
T13283C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/528-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3816-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3816-10-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5240-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5240-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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