juko | 037b181c47d857b811b5833d842e4603c9806f1e7fbc38cb455a9454268a4e30

General

Target
2026-08-09_b9f47f2655f1258399bf9e99d712f31e_elex_wannacry.exe
Size 50KB
Sample260809-m5pdxaztfw
SHA256 037b181c47d857b811b5833d842e4603c9806f1e7fbc38cb455a9454268a4e30
MD5 b9f47f2655f1258399bf9e99d712f31e
SHA1 6dde9a36ad07759089ad6470c2c3ce4eb5bbdfe7
SHA512 24d36d8058562ab7d9a49b8a64da8c73d7fdcd164a16d5ba7a9fb836369e62be3ca0a9ed314085af29cd4ef6b0dfe4d49f4e89fd152fba0506e5b4dc605443c8
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOT:tLsF2Kerc64sTiX2IV0DpL8SE9nYOT
TLSH
T14A33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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/0x0009000000016cdb-4.dat	family_juko
behavioral2/files/0x000e00000001c51a-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3480	WINWORD.exe
2660	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-1-5-21-3989226554-2204910950-1522900112-1000\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
5092	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_b9f47f2655f1258399bf9e99d712f31e_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
5092	cmd.exe
1236	PING.EXE
3592	PING.EXE
3372	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1236	PING.EXE
3592	PING.EXE
3372	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 932 wrote to memory of 3480	932	2026-08-09_b9f47f2655f1258399bf9e99d712f31e_elex_wannacry.exe	89
PID 3480 wrote to memory of 5092	3480	WINWORD.exe	90
PID 5092 wrote to memory of 1236	5092	cmd.exe	92
PID 5092 wrote to memory of 3592	5092	cmd.exe	93
PID 5092 wrote to memory of 3372	5092	cmd.exe	94
PID 5092 wrote to memory of 2660	5092	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_b9f47f2655f1258399bf9e99d712f31e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_b9f47f2655f1258399bf9e99d712f31e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:932
- 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:3480
- - 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\00002BEE" 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:5092
  - - 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:1236
  - - 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:3592
  - - 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:3372
  - - 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:2660

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

00002BEE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002BEE
Size 50KB
SHA256 1edbba552021818b775c1d758cb957297a4d8117ab99c01503ec811b7df0cd4c
MD5 032dbea7736d2218bf0707bb7ae9380c
SHA1 37f84a6546020f51d0474b6382fc89911d082db3
SHA512 e3e2479e60078d8b6f739cfdd9768df0d006f4050e88afd811cc197aa4a10dcb89f44564fd926da145137622a9eb8036b9220e17284c1db508aaca0d224edc87
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOm:tLsF2Kerc64sTiX2IV0DpL8SE9nYOm
TLSH
T1DE33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF7298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 037b181c47d857b811b5833d842e4603c9806f1e7fbc38cb455a9454268a4e30
MD5 b9f47f2655f1258399bf9e99d712f31e
SHA1 6dde9a36ad07759089ad6470c2c3ce4eb5bbdfe7
SHA512 24d36d8058562ab7d9a49b8a64da8c73d7fdcd164a16d5ba7a9fb836369e62be3ca0a9ed314085af29cd4ef6b0dfe4d49f4e89fd152fba0506e5b4dc605443c8
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOT:tLsF2Kerc64sTiX2IV0DpL8SE9nYOT
TLSH
T14A33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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