juko | 0bc2ab586a820e456c505325909f5a01f22cc7c7a4e200824253248eda289a72

General

Target
2026-10-22_6e3c8b26d30080bea85349251e2e45aa_elex_wannacry.exe
Size 86KB
Sample261024-lca55sef67
SHA256 0bc2ab586a820e456c505325909f5a01f22cc7c7a4e200824253248eda289a72
MD5 6e3c8b26d30080bea85349251e2e45aa
SHA1 51778f0f1a1c768d733c85d322249b6ed9046ddf
SHA512 b74ead0e594735f361a4574dd104e37b304904435f1ce82de450c332e27f9e4def80e83ac8f595a4b5a815a18c2a6ff4dcbf40ad9e9654a6c146efaa800ae832
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpI:vLy2Kerc64CiGImMPu/ouEQkwpI
TLSH
T19B83C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
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
behavioral1/memory/1396-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x001300000001db06-4.dat	family_juko
behavioral1/memory/1396-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/748-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000a00000002446a-15.dat	family_juko
behavioral1/memory/4316-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4316-19-0x0000000000400000-0x0000000000425000-memory.dmp	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-1-5-21-747854149-4118156852-591593384-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-747854149-4118156852-591593384-1000\Control Panel\International\Geo\Nation	2026-10-22_6e3c8b26d30080bea85349251e2e45aa_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
748	WINWORD.exe
4316	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-1-5-21-747854149-4118156852-591593384-1000\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
1360	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	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	2026-10-22_6e3c8b26d30080bea85349251e2e45aa_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

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
1360	cmd.exe
1820	PING.EXE
2280	PING.EXE
2340	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1820	PING.EXE
2280	PING.EXE
2340	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1396 wrote to memory of 748	1396	2026-10-22_6e3c8b26d30080bea85349251e2e45aa_elex_wannacry.exe	85
PID 748 wrote to memory of 1360	748	WINWORD.exe	86
PID 1360 wrote to memory of 1820	1360	cmd.exe	88
PID 1360 wrote to memory of 2280	1360	cmd.exe	91
PID 1360 wrote to memory of 2340	1360	cmd.exe	94
PID 1360 wrote to memory of 4316	1360	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-22_6e3c8b26d30080bea85349251e2e45aa_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_6e3c8b26d30080bea85349251e2e45aa_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1396
- 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:748
- - 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\0000476E" 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:1360
  - - 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:1820
  - - 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:2280
  - - 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:2340
  - - 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:4316

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000476E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000476E
Size 86KB
SHA256 edd58f380dd976523fcfe73e3bcd88241768a170f9232f32c6b22c12e05ecfc3
MD5 543789ecc874e87c7be6dd62c67a79d1
SHA1 4bc297f6d7eaceb756d5ab293ec4b81838058725
SHA512 df47d958c944c126962cce735a72fbccb7b6168236cb0ede5fea56c6152859c3baea8e2214bfae244dff76c89f4c195af75a09b671c7554c0950e9eedff35bf1
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwp1:vLy2Kerc64CiGImMPu/ouEQkwp1
TLSH
T10783C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 86KB
SHA256 0bc2ab586a820e456c505325909f5a01f22cc7c7a4e200824253248eda289a72
MD5 6e3c8b26d30080bea85349251e2e45aa
SHA1 51778f0f1a1c768d733c85d322249b6ed9046ddf
SHA512 b74ead0e594735f361a4574dd104e37b304904435f1ce82de450c332e27f9e4def80e83ac8f595a4b5a815a18c2a6ff4dcbf40ad9e9654a6c146efaa800ae832
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpI:vLy2Kerc64CiGImMPu/ouEQkwpI
TLSH
T19B83C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/748-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1396-0-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/1396-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4316-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4316-19-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads