juko | d27ffa955deea824ef016ab1587ad543250b2caa26016da72dcae6c158920e0f

General

Target
2026-08-09_80b16466258cbbcade3ed9a3b67d8a37_elex_wannacry.exe
Size 50KB
Sample260809-3w4p8sda35
SHA256 d27ffa955deea824ef016ab1587ad543250b2caa26016da72dcae6c158920e0f
MD5 80b16466258cbbcade3ed9a3b67d8a37
SHA1 a4296a52389cc90f64577401ef9840ac081c50cf
SHA512 7045804b3d29d27cd23f2f94231b1b76cbc433de1af94d652529bd78c93138e4a1ac7ad75a14aacc5008a92f1278bf42df3333d96ea76e52d31dc45a373632bb
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOv:tLsF2Kerc64sTiX2IV0DpL8SE9nYOv
TLSH
T11633291A3B41E1D1C4A351B0EC5B4F74983AEDB58E676103BB85B70D1CB2A52CF3298E
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/0x0010000000019c8f-4.dat	family_juko
behavioral2/files/0x000e00000001c50d-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
256	WINWORD.exe
2280	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-1-5-21-1079202589-886135813-2527035092-1000\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
1208	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_80b16466258cbbcade3ed9a3b67d8a37_elex_wannacry.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
3220	PING.EXE
1208	cmd.exe
1252	PING.EXE
4112	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4112	PING.EXE
3220	PING.EXE
1252	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2084 wrote to memory of 256	2084	2026-08-09_80b16466258cbbcade3ed9a3b67d8a37_elex_wannacry.exe	89
PID 256 wrote to memory of 1208	256	WINWORD.exe	90
PID 1208 wrote to memory of 1252	1208	cmd.exe	92
PID 1208 wrote to memory of 4112	1208	cmd.exe	93
PID 1208 wrote to memory of 3220	1208	cmd.exe	94
PID 1208 wrote to memory of 2280	1208	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_80b16466258cbbcade3ed9a3b67d8a37_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_80b16466258cbbcade3ed9a3b67d8a37_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2084
- 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:256
- - 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\00003540" 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:1208
  - - 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:1252
  - - 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:4112
  - - 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:\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:2280

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

Replay Monitor

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Downloads

00003540

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003540
Size 50KB
SHA256 44b5a0aadd82363169b39450d042a9bcec9812e6721575f95cae4d1b1cacf4bc
MD5 77f4c6370fc67659c2da39a65ba2ef31
SHA1 738d5289182f1555fa80673e250507065a3b0a5c
SHA512 44b5aa09dbb1bb9f8495c36bfdf2b97c90dec315c79d9ca837b08ebe4d12f7baf0c090c0f6c3aa81416fcce8af3c426db1e65ec0b81ba1125e16dfffa06d9e33
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILO6:tLsF2Kerc64sTiX2IV0DpL8SE9nYO6
TLSH
T16C33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 d27ffa955deea824ef016ab1587ad543250b2caa26016da72dcae6c158920e0f
MD5 80b16466258cbbcade3ed9a3b67d8a37
SHA1 a4296a52389cc90f64577401ef9840ac081c50cf
SHA512 7045804b3d29d27cd23f2f94231b1b76cbc433de1af94d652529bd78c93138e4a1ac7ad75a14aacc5008a92f1278bf42df3333d96ea76e52d31dc45a373632bb
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOv:tLsF2Kerc64sTiX2IV0DpL8SE9nYOv
TLSH
T11633291A3B41E1D1C4A351B0EC5B4F74983AEDB58E676103BB85B70D1CB2A52CF3298E
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