juko | 5003da99763d4bd8724e9aed298c037880b94e5846dc3ab7430d367ac5a9e177

General

Target
2026-07-23_27dd275ff12e96ab3909fe01c183cec9_elex_wannacry.exe
Size 48KB
Sample260723-ym4awsch98
SHA256 5003da99763d4bd8724e9aed298c037880b94e5846dc3ab7430d367ac5a9e177
MD5 27dd275ff12e96ab3909fe01c183cec9
SHA1 6b29995d5acdd63e5a4c9713d14998504e56853d
SHA512 45817cd56cbef16ba80ba01884b31d4c3cc9c19d448989c1e1595b2ce27f3c3466c7425f164c6c08c694e46df6ef9dc9ef6e676c33c743b1ec2609b5e60273f9
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v83:bLy2Kerc64CiGImav42j0f
TLSH
T191234A2EB5A26068C55390B0E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
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/4880-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0007000000016b47-5.dat	family_juko
behavioral2/memory/4880-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3260-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b00000001bc4d-13.dat	family_juko
behavioral2/memory/748-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/748-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3260	WINWORD.exe
748	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-1-5-21-2301830172-776172150-2531349243-1000\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
944	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	2026-07-23_27dd275ff12e96ab3909fe01c183cec9_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
944	cmd.exe
5136	PING.EXE
3660	PING.EXE
5216	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5136	PING.EXE
3660	PING.EXE
5216	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4880 wrote to memory of 3260	4880	2026-07-23_27dd275ff12e96ab3909fe01c183cec9_elex_wannacry.exe	89
PID 3260 wrote to memory of 944	3260	WINWORD.exe	90
PID 944 wrote to memory of 5136	944	cmd.exe	92
PID 944 wrote to memory of 3660	944	cmd.exe	93
PID 944 wrote to memory of 5216	944	cmd.exe	94
PID 944 wrote to memory of 748	944	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-23_27dd275ff12e96ab3909fe01c183cec9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-23_27dd275ff12e96ab3909fe01c183cec9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4880
- 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:3260
- - 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\00006D25" 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:944
  - - 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:5136
  - - 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:3660
  - - 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:5216
  - - 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:748

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

00006D25

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006D25
Size 48KB
SHA256 1c96c9df4c7201eb4eb8f4642677255d50ca349f0f59f27d423bc182aad10d85
MD5 fc4f8f191265125c74d6813bbe5a08a1
SHA1 5ff016a498cb1343f0c0fa9d6dcb1da85d7dc9d7
SHA512 e085774408a81b32900131fd60c3d2b003febf6bbfeac7bcc57f74312bd7e3e3a6dba32f30ffd8fa499a7d73a787b191b3d63db646b03d97e7c9967ae6dce0c0
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8y:bLy2Kerc64CiGImav42j0q
TLSH
T14C234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 5003da99763d4bd8724e9aed298c037880b94e5846dc3ab7430d367ac5a9e177
MD5 27dd275ff12e96ab3909fe01c183cec9
SHA1 6b29995d5acdd63e5a4c9713d14998504e56853d
SHA512 45817cd56cbef16ba80ba01884b31d4c3cc9c19d448989c1e1595b2ce27f3c3466c7425f164c6c08c694e46df6ef9dc9ef6e676c33c743b1ec2609b5e60273f9
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v83:bLy2Kerc64CiGImav42j0f
TLSH
T191234A2EB5A26068C55390B0E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/748-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/748-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3260-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4880-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4880-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads