juko | f25c22233996dfcc31bf3614123af075cd7afb96204e7f498973af51954a19d5

General

Target
2026-08-09_99b8e888b2853ecf42e8b330f7912447_elex_wannacry.exe
Size 50KB
Sample260809-k2wbyavapa
SHA256 f25c22233996dfcc31bf3614123af075cd7afb96204e7f498973af51954a19d5
MD5 99b8e888b2853ecf42e8b330f7912447
SHA1 2a3ead9605db1829188d34418663711e218d8c59
SHA512 3c09455fb010a621b729becadbb10cbd1e0c60decff5dfd7788e832079a22b2f9e445be703ea75b2e5d81401b015e379402cae8bd700779c833e46483cc31a54
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOQ:tLsF2Kerc64sTiX2IV0DpL8SE9nYOQ
TLSH
T15833291A3B41E1D1C4A351B0EC5B4F74983AEDB58E676103BB85B70D1CB2A52CF3298E
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/0x000a000000019cc1-4.dat	family_juko
behavioral2/files/0x000d00000001c5e0-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4332	WINWORD.exe
1276	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
4904	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	2026-08-09_99b8e888b2853ecf42e8b330f7912447_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
2548	PING.EXE
4588	PING.EXE
3116	PING.EXE
4904	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2548	PING.EXE
4588	PING.EXE
3116	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2608 wrote to memory of 4332	2608	2026-08-09_99b8e888b2853ecf42e8b330f7912447_elex_wannacry.exe	89
PID 4332 wrote to memory of 4904	4332	WINWORD.exe	90
PID 4904 wrote to memory of 2548	4904	cmd.exe	92
PID 4904 wrote to memory of 4588	4904	cmd.exe	93
PID 4904 wrote to memory of 3116	4904	cmd.exe	94
PID 4904 wrote to memory of 1276	4904	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_99b8e888b2853ecf42e8b330f7912447_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_99b8e888b2853ecf42e8b330f7912447_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2608
- 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:4332
- - 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\00006376" 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:4904
  - - 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:2548
  - - 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:4588
  - - 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:3116
  - - 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:1276

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:564

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

00006376

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006376
Size 50KB
SHA256 4a8b01f8c80ff7ee0476c32dbd09ed4ad08f2810b3f41385a1c7a51938f2f18a
MD5 96ef59ec7776f0f530ae322be159eb1f
SHA1 45b1412e6b0fda9218fded2007f9744ccf72f26f
SHA512 24a6217a1655712827d7d233a56c0ba434b12ded7a5a344b8e2798880ac403980b6ffde0e8c4a2a75532730e8e9dd72ed47cd85bfb26fde28f77de65d2713d04
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOI:tLsF2Kerc64sTiX2IV0DpL8SE9nYOI
TLSH
T14933291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 f25c22233996dfcc31bf3614123af075cd7afb96204e7f498973af51954a19d5
MD5 99b8e888b2853ecf42e8b330f7912447
SHA1 2a3ead9605db1829188d34418663711e218d8c59
SHA512 3c09455fb010a621b729becadbb10cbd1e0c60decff5dfd7788e832079a22b2f9e445be703ea75b2e5d81401b015e379402cae8bd700779c833e46483cc31a54
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOQ:tLsF2Kerc64sTiX2IV0DpL8SE9nYOQ
TLSH
T15833291A3B41E1D1C4A351B0EC5B4F74983AEDB58E676103BB85B70D1CB2A52CF3298E
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