juko | 8ac11574f77fc163680fdee9c1c6d43487a74a8f1f2dadefefd1aa50da999193

General

Target
2026-11-03_371a136f065f60ed2fefdd98889022e3_elex_wannacry.exe
Size 49KB
Sample261104-3tryna1w6j
SHA256 8ac11574f77fc163680fdee9c1c6d43487a74a8f1f2dadefefd1aa50da999193
MD5 371a136f065f60ed2fefdd98889022e3
SHA1 638a1e7f37869985026d98db8223f0b3ae31356a
SHA512 dfa94877d0a2689765a83df5d891de6c8cf312703a4f870e4e235d6df03d320dce13990f3f76c20a09cdf43aa9d500b4423fd283c3c6a6da36fcf5f35b8e6b16
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h22:VLy2Kerc64CiGImVu8p4kojWh22
TLSH
T146334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4552-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000700000001b9be-4.dat	family_juko
behavioral2/memory/4552-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2564-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0005000000008f26-13.dat	family_juko
behavioral2/memory/1272-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1272-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2564	WINWORD.exe
1272	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-1-5-21-4280978039-528710165-233981602-1000\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
5456	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	2026-11-03_371a136f065f60ed2fefdd98889022e3_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
5456	cmd.exe
1860	PING.EXE
1312	PING.EXE
2828	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1860	PING.EXE
1312	PING.EXE
2828	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4552 wrote to memory of 2564	4552	2026-11-03_371a136f065f60ed2fefdd98889022e3_elex_wannacry.exe	89
PID 2564 wrote to memory of 5456	2564	WINWORD.exe	90
PID 5456 wrote to memory of 1860	5456	cmd.exe	92
PID 5456 wrote to memory of 1312	5456	cmd.exe	93
PID 5456 wrote to memory of 2828	5456	cmd.exe	94
PID 5456 wrote to memory of 1272	5456	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-11-03_371a136f065f60ed2fefdd98889022e3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-03_371a136f065f60ed2fefdd98889022e3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4552
- 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:2564
- - 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\00002610" 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:5456
  - - 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:1860
  - - 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:1312
  - - 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:2828
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:1272

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00002610

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002610
Size 49KB
SHA256 05d2789fb52c7eec1b523eb1ba0e9798a4aa9d4d874aafc271ac6bd193667ac0
MD5 8e50372b0848086c00917e1070084573
SHA1 7c8be9ce7990041c3b7973b041ae94f33a1d17fb
SHA512 31176991158e633872afeeab8f3f6b11404b5ec2155cfb7de9eb0dbcbfedb29dfa9f7e160ae181ccf746afdb42da0d2cfb1d6a5865a8909a17aac33a34541a13
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2g:VLy2Kerc64CiGImVu8p4kojWh2g
TLSH
T196334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 8ac11574f77fc163680fdee9c1c6d43487a74a8f1f2dadefefd1aa50da999193
MD5 371a136f065f60ed2fefdd98889022e3
SHA1 638a1e7f37869985026d98db8223f0b3ae31356a
SHA512 dfa94877d0a2689765a83df5d891de6c8cf312703a4f870e4e235d6df03d320dce13990f3f76c20a09cdf43aa9d500b4423fd283c3c6a6da36fcf5f35b8e6b16
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h22:VLy2Kerc64CiGImVu8p4kojWh22
TLSH
T146334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1272-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1272-17-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2564-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4552-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4552-10-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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