juko | 741efe3fde927aba7c763707743b5dc1e340f29a9fed50d9d9047522a92f4f66

General

Target
2026-08-09_36d6be682777736248731e22cd0b4b60_elex_wannacry.exe
Size 50KB
Sample260809-k7c3jsx1cs
SHA256 741efe3fde927aba7c763707743b5dc1e340f29a9fed50d9d9047522a92f4f66
MD5 36d6be682777736248731e22cd0b4b60
SHA1 76e8703fbf4a4206b39bd0dd9f0bacdab1f2ac38
SHA512 b7ae2e25549cfb3d13a2068b5021cd6da54563b4f5e7a414e2ef2019b0e9c059d829c5644358910cea66585d4dbbd9e15a033649ea59bf35b14135e303f591e7
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOv:tLsF2Kerc64sTiX2IV0DpL8SE9nYOv
TLSH
T1DE33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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/0x000800000001b853-4.dat	family_juko
behavioral2/files/0x000e00000001c487-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
924	WINWORD.exe
3452	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-1-5-21-4046655672-1449839301-2197395821-1000\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
5224	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	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_36d6be682777736248731e22cd0b4b60_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

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
2912	PING.EXE
2896	PING.EXE
5224	cmd.exe
5824	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5824	PING.EXE
2912	PING.EXE
2896	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5408 wrote to memory of 924	5408	2026-08-09_36d6be682777736248731e22cd0b4b60_elex_wannacry.exe	89
PID 924 wrote to memory of 5224	924	WINWORD.exe	90
PID 5224 wrote to memory of 5824	5224	cmd.exe	92
PID 5224 wrote to memory of 2912	5224	cmd.exe	93
PID 5224 wrote to memory of 2896	5224	cmd.exe	94
PID 5224 wrote to memory of 3452	5224	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_36d6be682777736248731e22cd0b4b60_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_36d6be682777736248731e22cd0b4b60_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5408
- 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:924
- - 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\00004E5D" 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:5224
  - - 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:5824
  - - 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:2912
  - - 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:2896
  - - 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:3452

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

00004E5D

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004E5D
Size 50KB
SHA256 1aa914c51991749e4cf49b5f9ac775e010618888f738ffaa79c42cd4eeaf3b00
MD5 01e2f98f948b7681e4a28e227d9d9728
SHA1 20d492c3a9d1b2dc989efb0cc204d16a81fb893d
SHA512 60299312e0a7dde00596cda01a4129dcf3ee1e5d24631acff6715503664e60b71869a77bfeb216b55f6a8bb396fddaeb37ab089cb8c2a1e96d1458b3464772fb
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOl:tLsF2Kerc64sTiX2IV0DpL8SE9nYOl
TLSH
T14233291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 741efe3fde927aba7c763707743b5dc1e340f29a9fed50d9d9047522a92f4f66
MD5 36d6be682777736248731e22cd0b4b60
SHA1 76e8703fbf4a4206b39bd0dd9f0bacdab1f2ac38
SHA512 b7ae2e25549cfb3d13a2068b5021cd6da54563b4f5e7a414e2ef2019b0e9c059d829c5644358910cea66585d4dbbd9e15a033649ea59bf35b14135e303f591e7
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOv:tLsF2Kerc64sTiX2IV0DpL8SE9nYOv
TLSH
T1DE33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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