juko | 3e3bb1df0ff34bc3ad45c4fb3d955e0a052b4c035910c59fe80c4042006b808f

General

Target
2026-08-16_6173f5cfdd8cdf80a9fb35120a1f9620_elex_wannacry.exe
Size 88KB
Sample260816-e3knyazzds
SHA256 3e3bb1df0ff34bc3ad45c4fb3d955e0a052b4c035910c59fe80c4042006b808f
MD5 6173f5cfdd8cdf80a9fb35120a1f9620
SHA1 7f715a66b6764342a36cc5d5b6ba29ab00089b96
SHA512 5c3ed20eba2192b292afbc99494f44bc609b67fff777661b315b86f0bbc57f4c3fa20391d872d1d72fbf81104703426d6e858d533e090b5b66732a5b22eb80ad
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrG:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193e
TLSH
T1D2934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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/0x00120000000118ee-4.dat	family_juko
behavioral2/files/0x000d00000001c638-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4744	WINWORD.exe
6944	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-1-5-21-1014449518-1831897916-4205727055-1000\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
5272	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	2026-08-16_6173f5cfdd8cdf80a9fb35120a1f9620_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
5272	cmd.exe
2700	PING.EXE
3676	PING.EXE
1692	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2700	PING.EXE
3676	PING.EXE
1692	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1776 wrote to memory of 4744	1776	2026-08-16_6173f5cfdd8cdf80a9fb35120a1f9620_elex_wannacry.exe	89
PID 4744 wrote to memory of 5272	4744	WINWORD.exe	90
PID 5272 wrote to memory of 2700	5272	cmd.exe	92
PID 5272 wrote to memory of 3676	5272	cmd.exe	93
PID 5272 wrote to memory of 1692	5272	cmd.exe	94
PID 5272 wrote to memory of 6944	5272	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-16_6173f5cfdd8cdf80a9fb35120a1f9620_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-16_6173f5cfdd8cdf80a9fb35120a1f9620_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1776
- 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:4744
- - 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\000040C7" 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:5272
  - - 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:2700
  - - 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:3676
  - - 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:1692
  - - 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:6944

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

000040C7

Path C:\Users\Admin\AppData\Roaming\Mozilla\000040C7
Size 88KB
SHA256 02527531a4e5b9fb19d0a35b3a883446a8cdf6a6108be92446d0fb387554f543
MD5 3024564542ed525b43c545b50e9c44a1
SHA1 5bc17d7ac88b3dfc383d08c899151f9865ad9312
SHA512 91b190255e3f78ceef6e084a2acbcb9b10fdd7c243038ca9205c8252501f5a4df7672b7f588b78572db6e48bf350671fc8bd8359ec7132b9356cd2470723e138
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrj:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193b
TLSH
T1D1934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 3e3bb1df0ff34bc3ad45c4fb3d955e0a052b4c035910c59fe80c4042006b808f
MD5 6173f5cfdd8cdf80a9fb35120a1f9620
SHA1 7f715a66b6764342a36cc5d5b6ba29ab00089b96
SHA512 5c3ed20eba2192b292afbc99494f44bc609b67fff777661b315b86f0bbc57f4c3fa20391d872d1d72fbf81104703426d6e858d533e090b5b66732a5b22eb80ad
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrG:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193e
TLSH
T1D2934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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