juko | b1bc73dfab316fc6d3eb4356a62acb3e46af12e49585211762cea7a4d031638c

General

Target
2026-08-30_37dd86726d8a64843325be207fd5c3be_elex_wannacry.exe
Size 32KB
Sample260901-dpslyssclh
SHA256 b1bc73dfab316fc6d3eb4356a62acb3e46af12e49585211762cea7a4d031638c
MD5 37dd86726d8a64843325be207fd5c3be
SHA1 fff5082826e26bb455f063fc58e6a062f835528c
SHA512 692372a5abe80c4b7e8957e59f469947f67b7d2b26ca667449266acf95eeebeb226772e049eb0990bc785e9d789783d98c0e2ea26260e3fa09a17bdd4ec084b5
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfK:tLsF2Kerc64sTiX2IV0DYQi
TLSH
T1ECE23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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/0x000b000000019cc9-4.dat	family_juko
behavioral2/files/0x000e00000001c52d-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1492	WINWORD.exe
1964	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-1-5-21-1738198120-2966725515-3980530802-1000\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
1244	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	2026-08-30_37dd86726d8a64843325be207fd5c3be_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
5752	PING.EXE
4272	PING.EXE
1244	cmd.exe
3504	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3504	PING.EXE
5752	PING.EXE
4272	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1496 wrote to memory of 1492	1496	2026-08-30_37dd86726d8a64843325be207fd5c3be_elex_wannacry.exe	90
PID 1492 wrote to memory of 1244	1492	WINWORD.exe	91
PID 1244 wrote to memory of 3504	1244	cmd.exe	93
PID 1244 wrote to memory of 5752	1244	cmd.exe	94
PID 1244 wrote to memory of 4272	1244	cmd.exe	95
PID 1244 wrote to memory of 1964	1244	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-30_37dd86726d8a64843325be207fd5c3be_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_37dd86726d8a64843325be207fd5c3be_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1496
- 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:1492
- - 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\0000144A" 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:1244
  - - 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:3504
  - - 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:5752
  - - 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:4272
  - - 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:1964

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

Loading Replay Monitor...

Downloads

0000144A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000144A
Size 32KB
SHA256 6885137cdd786d2f679b029da3b198fcbc6b46745bc027a33fa761161c0fe511
MD5 4e1a554dd6ab7b89faac240df95203e0
SHA1 a1e9456aafb2bb5004e82fa57a038f7bf1e58106
SHA512 86da03aed1d36339b3cd6574132b66b67e4627d7009b79b60c57f80ad7134c45bc5d26fb686e09a9b667faaf952432e752f278561f9232029678e7c1ae60e98a
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfP:tLsF2Kerc64sTiX2IV0DYQ3
TLSH
T1EFE23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 b1bc73dfab316fc6d3eb4356a62acb3e46af12e49585211762cea7a4d031638c
MD5 37dd86726d8a64843325be207fd5c3be
SHA1 fff5082826e26bb455f063fc58e6a062f835528c
SHA512 692372a5abe80c4b7e8957e59f469947f67b7d2b26ca667449266acf95eeebeb226772e049eb0990bc785e9d789783d98c0e2ea26260e3fa09a17bdd4ec084b5
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfK:tLsF2Kerc64sTiX2IV0DYQi
TLSH
T1ECE23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads