juko | 5a7136073ce1d798de806df246e7647ab59c312cca111d6d2d9dedb4e1e5c16d

General

Target
2026-08-19_854cd4082051344de0c0929ac381855a_elex_wannacry.exe
Size 49KB
Sample260820-b2bsvsxfrb
SHA256 5a7136073ce1d798de806df246e7647ab59c312cca111d6d2d9dedb4e1e5c16d
MD5 854cd4082051344de0c0929ac381855a
SHA1 772dc33499824222dde687c8c4a4999d14eeb28c
SHA512 3fc2ad07bded81d2fc637e7ad8c58894d8c11ee69d5b07c08a7d550134d4ce2fd570c49c9c6dfb2db71dea208cc31ac8c0938f55909c4ee2f052d7662bf4afe0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h28:VLy2Kerc64CiGImVucp4kojWh28
TLSH
T142334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 7 IoCs

resource	yara_rule
behavioral1/memory/2596-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x001300000002416d-5.dat	family_juko
behavioral1/memory/2596-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2460-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00080000000242c7-15.dat	family_juko
behavioral1/memory/2724-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2724-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-08-19_854cd4082051344de0c0929ac381855a_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2460	WINWORD.exe
2724	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-1-5-21-889581200-2041691093-2048517887-1000\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
1896	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	2026-08-19_854cd4082051344de0c0929ac381855a_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
4992	PING.EXE
1896	cmd.exe
4792	PING.EXE
4564	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4564	PING.EXE
4992	PING.EXE
4792	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2596 wrote to memory of 2460	2596	2026-08-19_854cd4082051344de0c0929ac381855a_elex_wannacry.exe	84
PID 2460 wrote to memory of 1896	2460	WINWORD.exe	85
PID 1896 wrote to memory of 4792	1896	cmd.exe	87
PID 1896 wrote to memory of 4564	1896	cmd.exe	88
PID 1896 wrote to memory of 4992	1896	cmd.exe	89
PID 1896 wrote to memory of 2724	1896	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-19_854cd4082051344de0c0929ac381855a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-19_854cd4082051344de0c0929ac381855a_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2596
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2460
- - 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\000069CB" 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:1896
  - - 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:4792
  - - 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:4564
  - - 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:4992
  - - 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:2724

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

000069CB

Path C:\Users\Admin\AppData\Roaming\Mozilla\000069CB
Size 49KB
SHA256 8c9e68d229cd5698e5f351a2acdeace999ddfeae5068c7ae6793b7d72f155558
MD5 b15a1ef899d48a26616575a6a2c36d11
SHA1 9cd08be6ffc1a6b40d6839ec4691cbd847650484
SHA512 903324c5894fdce783941e86b68b4ccf39accda7da1feb79119964060beec986022be2ed65d77a8785e1dcd2eb86a7320524caee89a9fc5ea15b921afbd83abd
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2k:VLy2Kerc64CiGImVucp4kojWh2k
TLSH
T123334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 5a7136073ce1d798de806df246e7647ab59c312cca111d6d2d9dedb4e1e5c16d
MD5 854cd4082051344de0c0929ac381855a
SHA1 772dc33499824222dde687c8c4a4999d14eeb28c
SHA512 3fc2ad07bded81d2fc637e7ad8c58894d8c11ee69d5b07c08a7d550134d4ce2fd570c49c9c6dfb2db71dea208cc31ac8c0938f55909c4ee2f052d7662bf4afe0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h28:VLy2Kerc64CiGImVucp4kojWh28
TLSH
T142334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2460-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2596-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2596-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2724-17-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2724-18-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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