juko | 11c676e8405e685b0661f4c356e676b635e835d39619e6f05ac53cd1de83a67e

General

Target
2026-08-01_e2fb88986a12581a843bd1779cb24b68_elex_wannacry.exe
Size 69KB
Sample260802-eezsystfma
SHA256 11c676e8405e685b0661f4c356e676b635e835d39619e6f05ac53cd1de83a67e
MD5 e2fb88986a12581a843bd1779cb24b68
SHA1 31fd9164f38a28057322df2dc7c581d219bfcb0c
SHA512 81cf6c3d3d89afa80e98deb64acb7be777380ef003f957bfbd5df8cb027d5a50642c73416d2787675323417f5b00626fb18d92c93dd7dd582e5b42f6bdbf77a5
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM9w:tLy2Kerc64CiGIm1K851YOhqYBwEM9w
TLSH
T1AF63F70737A4A1E1D0A35270E8660B649B37ECB19A73A3077B94771D1DB2A41CF31B9B
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/0x000d00000001c5df-4.dat	family_juko
behavioral2/files/0x000e00000001c5e0-10.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	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	2026-08-01_e2fb88986a12581a843bd1779cb24b68_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

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
4588	PING.EXE
3116	PING.EXE
4904	cmd.exe
2548	PING.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 4984 wrote to memory of 4332	4984	2026-08-01_e2fb88986a12581a843bd1779cb24b68_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\2026-08-01_e2fb88986a12581a843bd1779cb24b68_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_e2fb88986a12581a843bd1779cb24b68_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4984
- 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\000064A6" 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:4336

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

000064A6

Path C:\Users\Admin\AppData\Roaming\Mozilla\000064A6
Size 69KB
SHA256 23447c1281bd22d694dcbd85f7a80f931edf3be7da4b61d2cc83f8a5b8fa74a3
MD5 1d4cd432f244731e67d25a26132f562f
SHA1 da2b8c184307c97bb28bfd4a37ad5091df204dac
SHA512 55cb36287456d67f52debf87dbff173e2e66bca6eb08d8875143be7e9b9be61bcdc59c469a1b7405577fb5948d408ba40351fa5a39b0dc184c70161cd09badc0
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM9I:tLy2Kerc64CiGIm1K851YOhqYBwEM9I
TLSH
T14163F70737A4A1E1D0A35270E8660B649B37ECB19A73A2077B94771D1DB2A41CF31B9B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 69KB
SHA256 11c676e8405e685b0661f4c356e676b635e835d39619e6f05ac53cd1de83a67e
MD5 e2fb88986a12581a843bd1779cb24b68
SHA1 31fd9164f38a28057322df2dc7c581d219bfcb0c
SHA512 81cf6c3d3d89afa80e98deb64acb7be777380ef003f957bfbd5df8cb027d5a50642c73416d2787675323417f5b00626fb18d92c93dd7dd582e5b42f6bdbf77a5
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM9w:tLy2Kerc64CiGIm1K851YOhqYBwEM9w
TLSH
T1AF63F70737A4A1E1D0A35270E8660B649B37ECB19A73A3077B94771D1DB2A41CF31B9B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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