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 7 IoCs

resource	yara_rule
behavioral2/memory/6536-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x00120000000118ee-4.dat	family_juko
behavioral2/memory/6536-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/7044-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c613-13.dat	family_juko
behavioral2/memory/4636-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4636-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
7044	WINWORD.exe
4636	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
4720	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	2026-08-01_f89e5e0471987f824357e12e3478c7ca_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
2528	PING.EXE
4720	cmd.exe
5996	PING.EXE
2892	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5996	PING.EXE
2892	PING.EXE
2528	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6536 wrote to memory of 7044	6536	2026-08-01_f89e5e0471987f824357e12e3478c7ca_elex_wannacry.exe	88
PID 7044 wrote to memory of 4720	7044	WINWORD.exe	89
PID 4720 wrote to memory of 5996	4720	cmd.exe	91
PID 4720 wrote to memory of 2892	4720	cmd.exe	92
PID 4720 wrote to memory of 2528	4720	cmd.exe	93
PID 4720 wrote to memory of 4636	4720	cmd.exe	94

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6536
- 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:7044
- - 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\000000F4" 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:4720
  - - 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:5996
  - - 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:2892
  - - 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:2528
  - - 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:4636

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:3368

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

000000F4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000000F4
Size 49KB
SHA256 fa87e947294727b14b259b237e048ffb87d714a78b5a03fd2f67b02c1c0a5c10
MD5 94dd573efa250595b55034bc71f8d83a
SHA1 3fdf6d64960a0eed4be15c24c691ffb294afe952
SHA512 23f50be88a1d0ebf8179c2c27c73720161478ce922c042a95c0c6b08984840431eef602ab16c1dfb6d6bc9e8fc610a2bf6f98894bba9a9fe5ea6af0f15371974
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2s:VLy2Kerc64CiGImVucp4kojWh2s
TLSH
T10B334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/4636-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4636-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/6536-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6536-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/7044-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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