juko | d76e62b89c4cb6456d1726b89f095487e82642c9ef90c1a1e42b12f1c2c03882

General

Target
2026-08-09_083e872953bcb3ee7d695232770f6193_elex_wannacry.exe
Size 40KB
Sample260809-xhx3msxset
SHA256 d76e62b89c4cb6456d1726b89f095487e82642c9ef90c1a1e42b12f1c2c03882
MD5 083e872953bcb3ee7d695232770f6193
SHA1 e557d09e6a6be33058be7418027e7e5d704f3461
SHA512 df0623ce2b4bae090339f815b284534903ca98f1ba1db37e2c287e48d2fa2bf3af8372bfbea5ca4723b3cfaa26800bab3d3f4af04cf4c5d29b78f312ef3fedb7
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7to8:rLsF2Kerc64sTiX2IV0DRG8
TLSH
T10B032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
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/0x001300000001c482-4.dat	family_juko
behavioral2/files/0x000e00000001c541-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4780	WINWORD.exe
5616	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-1-5-21-1875162379-3804078649-638427191-1000\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
1472	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_083e872953bcb3ee7d695232770f6193_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
1472	cmd.exe
3220	PING.EXE
3620	PING.EXE
4328	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3220	PING.EXE
3620	PING.EXE
4328	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3948 wrote to memory of 4780	3948	2026-08-09_083e872953bcb3ee7d695232770f6193_elex_wannacry.exe	89
PID 4780 wrote to memory of 1472	4780	WINWORD.exe	90
PID 1472 wrote to memory of 3220	1472	cmd.exe	92
PID 1472 wrote to memory of 3620	1472	cmd.exe	93
PID 1472 wrote to memory of 4328	1472	cmd.exe	94
PID 1472 wrote to memory of 5616	1472	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_083e872953bcb3ee7d695232770f6193_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_083e872953bcb3ee7d695232770f6193_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3948
- 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:4780
- - 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\00003A8F" 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:1472
  - - 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:3220
  - - 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:3620
  - - 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:4328
  - - 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:5616

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

00003A8F

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003A8F
Size 40KB
SHA256 fc8b8a09abd327f7777c13da346c318e518d892307b43a420a4529ba7168b707
MD5 c833e0c068b21adfaf89ca3b887afea1
SHA1 7a700cb9f0f1ff5d68540fcc2f2663a8e156c0c1
SHA512 51b5803f0349b8586575dff27e9510f9b2a5129b20a27d847a191f19c466f93ae5458560b02a9c1020110b6a81135e5c9569ed40f71092c1ad42c16addab8c9e
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7tos:rLsF2Kerc64sTiX2IV0DRGs
TLSH
T1C3032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 40KB
SHA256 d76e62b89c4cb6456d1726b89f095487e82642c9ef90c1a1e42b12f1c2c03882
MD5 083e872953bcb3ee7d695232770f6193
SHA1 e557d09e6a6be33058be7418027e7e5d704f3461
SHA512 df0623ce2b4bae090339f815b284534903ca98f1ba1db37e2c287e48d2fa2bf3af8372bfbea5ca4723b3cfaa26800bab3d3f4af04cf4c5d29b78f312ef3fedb7
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7to8:rLsF2Kerc64sTiX2IV0DRG8
TLSH
T10B032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
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