juko | 72b0d37334116188ed93dec2195f04d5087efc9e6b78aac0e117b31ec1f1de72

General

Target
2026-08-01_f89e5e0471987f824357e12e3478c7ca_elex_wannacry.exe
Size 49KB
Sample260801-xe8d7sfb99
SHA256 72b0d37334116188ed93dec2195f04d5087efc9e6b78aac0e117b31ec1f1de72
MD5 f89e5e0471987f824357e12e3478c7ca
SHA1 333f1262da41bf85ddcea545cd7dc75f09be69c2
SHA512 ed691901619d52a76c9981bef9d3fa035206ad82a49bb785fb71bbadae43dea9eaa2d1849e1270d79f17303000fa7b7b4cfc55957d0d8623d65468668a86248a
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2o:VLy2Kerc64CiGImVucp4kojWh2o
TLSH
T17F334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 8 IoCs

resource	yara_rule
behavioral1/memory/1744-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000700000001dbba-5.dat	family_juko
behavioral1/memory/4564-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1744-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4564-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000400000001e69b-16.dat	family_juko
behavioral1/memory/4228-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4228-19-0x0000000000400000-0x0000000000420000-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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-08-01_f89e5e0471987f824357e12e3478c7ca_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4564	WINWORD.exe
4228	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-1-5-21-2937465464-4167303362-2236413517-1000\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
472	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_f89e5e0471987f824357e12e3478c7ca_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

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
472	cmd.exe
1768	PING.EXE
4636	PING.EXE
4692	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1768	PING.EXE
4636	PING.EXE
4692	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1744 wrote to memory of 4564	1744	2026-08-01_f89e5e0471987f824357e12e3478c7ca_elex_wannacry.exe	87
PID 4564 wrote to memory of 472	4564	WINWORD.exe	88
PID 472 wrote to memory of 1768	472	cmd.exe	90
PID 472 wrote to memory of 4636	472	cmd.exe	91
PID 472 wrote to memory of 4692	472	cmd.exe	92
PID 472 wrote to memory of 4228	472	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-01_f89e5e0471987f824357e12e3478c7ca_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_f89e5e0471987f824357e12e3478c7ca_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1744
- 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:4564
- - 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\00007B89" 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:472
  - - 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:1768
  - - 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:4636
  - - 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:\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:4228

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

00007B89

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007B89
Size 49KB
SHA256 4bb8ae289e3edfb275c2ee0b20318d7174634b57031387b7f81c6a8a68a1b68c
MD5 07f49c6e7e538108eb9392d9fdb858f4
SHA1 39d8d2df62e338acaf3b000bdad9f4c413cb718f
SHA512 94b4de3e725c83e19e87a6ec2630cf4b2a8bace3a86b7beb57cac30543f210665475f5ab0d5d86bbf04b2686a58a7481d4c12d3a6b346691b4f8d0eb7bd0092d
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2A:VLy2Kerc64CiGImVucp4kojWh2A
TLSH
T1A2334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 72b0d37334116188ed93dec2195f04d5087efc9e6b78aac0e117b31ec1f1de72
MD5 f89e5e0471987f824357e12e3478c7ca
SHA1 333f1262da41bf85ddcea545cd7dc75f09be69c2
SHA512 ed691901619d52a76c9981bef9d3fa035206ad82a49bb785fb71bbadae43dea9eaa2d1849e1270d79f17303000fa7b7b4cfc55957d0d8623d65468668a86248a
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2o:VLy2Kerc64CiGImVucp4kojWh2o
TLSH
T17F334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1744-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/1744-13-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4228-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4228-19-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4564-11-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4564-15-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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