juko | 4b7c4829381da5df7b4132189cf43ec2469c1fd9aec97365c45cec9e8e0145d3

General

Target
2026-08-09_fbcf882e5bc64d88eb8f433e873ffda6_elex_wannacry.exe
Size 32KB
Sample260809-m381jadq7t
SHA256 4b7c4829381da5df7b4132189cf43ec2469c1fd9aec97365c45cec9e8e0145d3
MD5 fbcf882e5bc64d88eb8f433e873ffda6
SHA1 86efe632eb1eee68b19380af7bdf7c6c76cf760d
SHA512 6c90acfffb552039355ce65ae40376e628ebe50b2bfea463e787dfb899ad9f746bcedd81b3c6ede64a680aceca1833b120b5cbbe7c2360a8149c7b1f0a40835e
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJnn:bLsF2Kerc64sTiX2IV0DEann
TLSH
T1C1E22B2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
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/0x000700000001b853-4.dat	family_juko
behavioral2/files/0x000d00000001c582-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1692	WINWORD.exe
3960	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-1-5-21-2115213192-531537726-3295841909-1000\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
1140	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_fbcf882e5bc64d88eb8f433e873ffda6_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

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
1140	cmd.exe
872	PING.EXE
4692	PING.EXE
4160	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4160	PING.EXE
872	PING.EXE
4692	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5772 wrote to memory of 1692	5772	2026-08-09_fbcf882e5bc64d88eb8f433e873ffda6_elex_wannacry.exe	89
PID 1692 wrote to memory of 1140	1692	WINWORD.exe	90
PID 1140 wrote to memory of 872	1140	cmd.exe	92
PID 1140 wrote to memory of 4692	1140	cmd.exe	93
PID 1140 wrote to memory of 4160	1140	cmd.exe	94
PID 1140 wrote to memory of 3960	1140	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_fbcf882e5bc64d88eb8f433e873ffda6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_fbcf882e5bc64d88eb8f433e873ffda6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5772
- 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:1692
- - 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\00003CFD" 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:1140
  - - 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:872
  - - 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:4692
  - - 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:4160
  - - 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:3960

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:3164

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

00003CFD

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003CFD
Size 32KB
SHA256 ec7e48fb64cf5f2dd80c5f9c5fec963135dab243a48c792dcdcbb796839609f5
MD5 edd9c755c305ed4d6ffa8d0e454613cc
SHA1 e9d693091af42c8ee710ed019b6dfac4d4137dc0
SHA512 b54f964b74e1c1d75a5617682921f6dbbda74e3137b250a41848e16a6c81aaf809ce680adb75dece61e746d74aaa052c58d8924165b886f05b1a295623f5b41d
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJnr:bLsF2Kerc64sTiX2IV0DEanr
TLSH
T14DE22B2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 4b7c4829381da5df7b4132189cf43ec2469c1fd9aec97365c45cec9e8e0145d3
MD5 fbcf882e5bc64d88eb8f433e873ffda6
SHA1 86efe632eb1eee68b19380af7bdf7c6c76cf760d
SHA512 6c90acfffb552039355ce65ae40376e628ebe50b2bfea463e787dfb899ad9f746bcedd81b3c6ede64a680aceca1833b120b5cbbe7c2360a8149c7b1f0a40835e
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJnn:bLsF2Kerc64sTiX2IV0DEann
TLSH
T1C1E22B2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
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