juko | 374ddfb0790785d55c69404d9bf1c76dd1825d03f7164ca68a7a3b61a3bfd11a

General

Target
2026-08-14_379922827509284a4998862d9f3e90a7_elex_wannacry.exe
Size 87KB
Sample260814-b7htcssvat
SHA256 374ddfb0790785d55c69404d9bf1c76dd1825d03f7164ca68a7a3b61a3bfd11a
MD5 379922827509284a4998862d9f3e90a7
SHA1 889d444e7da350aa5dbff6eadebcf388eb292902
SHA512 4941c85fda2cfec5793cea7b62eec549b3266fbd535740428a808fd682f7b0a30599062e8dd9aca7a2da3d4cac75cf61a31f1a7e240ef62303a7bfeeed89b6e5
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpB:2Ly2Kerc64CiGIm1K851YO6EQkwpB
TLSH
T1E593A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/2812-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000c00000001136a-5.dat	family_juko
behavioral2/memory/2812-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4896-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x0003000000008f2c-13.dat	family_juko
behavioral2/memory/3772-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3772-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4896	WINWORD.exe
3772	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
1296	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	2026-08-14_379922827509284a4998862d9f3e90a7_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
5712	PING.EXE
1296	cmd.exe
5672	PING.EXE
4368	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5712	PING.EXE
5672	PING.EXE
4368	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2812 wrote to memory of 4896	2812	2026-08-14_379922827509284a4998862d9f3e90a7_elex_wannacry.exe	89
PID 4896 wrote to memory of 1296	4896	WINWORD.exe	90
PID 1296 wrote to memory of 5672	1296	cmd.exe	92
PID 1296 wrote to memory of 4368	1296	cmd.exe	93
PID 1296 wrote to memory of 5712	1296	cmd.exe	94
PID 1296 wrote to memory of 3772	1296	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-14_379922827509284a4998862d9f3e90a7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-14_379922827509284a4998862d9f3e90a7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2812
- 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:4896
- - 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\00002546" 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:1296
  - - 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:5672
  - - 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:4368
  - - 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:5712
  - - 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:3772

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

00002546

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002546
Size 87KB
SHA256 4bc7e08eb7c5998ab7f86db7626a0ec3e9a753d1ae5150310c13dafc20a449eb
MD5 e44066da229b8609be759711cb90127d
SHA1 5650efaf7240a665cb3cbbd3837e8fbb0c59be4a
SHA512 841579db10577e13f24104a403366c488944d9775066f190b3368bac71d8327e9b88cf3e696fe2098f44ba0907bb4accc8e1219498f8ab9d23e00fb30c2551e9
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpW:2Ly2Kerc64CiGIm1K851YO6EQkwpW
TLSH
T16193A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 374ddfb0790785d55c69404d9bf1c76dd1825d03f7164ca68a7a3b61a3bfd11a
MD5 379922827509284a4998862d9f3e90a7
SHA1 889d444e7da350aa5dbff6eadebcf388eb292902
SHA512 4941c85fda2cfec5793cea7b62eec549b3266fbd535740428a808fd682f7b0a30599062e8dd9aca7a2da3d4cac75cf61a31f1a7e240ef62303a7bfeeed89b6e5
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpB:2Ly2Kerc64CiGIm1K851YO6EQkwpB
TLSH
T1E593A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2812-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2812-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3772-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3772-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4896-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads