juko | fd4b05c365331d3fd1a96316f8fd9a690dc7a9c047f992ef7dbf34569270fb79

General

Target
2026-08-02_c8f2ff9588e546630ebc3c915a9687a3_elex_wannacry.exe
Size 48KB
Sample260802-jvx2hsfj3x
SHA256 fd4b05c365331d3fd1a96316f8fd9a690dc7a9c047f992ef7dbf34569270fb79
MD5 c8f2ff9588e546630ebc3c915a9687a3
SHA1 a36959f46a1957a3c3a5abefd5e0b8866e80e1bf
SHA512 956874eec1dd587fd9967261adf68c56d6aca43bb1b26aaf08992125683beb181500c8deb510a88a5c4db3df1fe10ef6ca3add7782fe80da9fa40035d3e9a7b8
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v81:bLy2Kerc64CiGImav42j0d
TLSH
T199234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/2680-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c521-5.dat	family_juko
behavioral2/memory/2680-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4160-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c522-13.dat	family_juko
behavioral2/memory/4432-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4432-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4160	WINWORD.exe
4432	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-1-5-21-189034102-168398478-1159367937-1000\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
3424	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	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	2026-08-02_c8f2ff9588e546630ebc3c915a9687a3_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
3424	cmd.exe
4768	PING.EXE
2288	PING.EXE
4544	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4768	PING.EXE
2288	PING.EXE
4544	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2680 wrote to memory of 4160	2680	2026-08-02_c8f2ff9588e546630ebc3c915a9687a3_elex_wannacry.exe	89
PID 4160 wrote to memory of 3424	4160	WINWORD.exe	90
PID 3424 wrote to memory of 4768	3424	cmd.exe	92
PID 3424 wrote to memory of 2288	3424	cmd.exe	93
PID 3424 wrote to memory of 4544	3424	cmd.exe	94
PID 3424 wrote to memory of 4432	3424	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_c8f2ff9588e546630ebc3c915a9687a3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_c8f2ff9588e546630ebc3c915a9687a3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2680
- 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:4160
- - 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\000076F2" 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:3424
  - - 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:4768
  - - 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:2288
  - - 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:4544
  - - 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:4432

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

000076F2

Path C:\Users\Admin\AppData\Roaming\Mozilla\000076F2
Size 48KB
SHA256 3e0c9a44320fa1d5193fe0a84ce3fb3c07dcaeda788b4f1c2d500d7a753b784a
MD5 7a42819807fb1b9e64f1dc4d5457fdd2
SHA1 efe12382d5ad6d232a1a48e0c63677074e2ad1c8
SHA512 b1f8563a78c2354cecb61fbf513d2631a71583d2429659364c4c53cb0e3856561df8c9ca3fb07895e6df3d0d8b2e79381eab3d0e4e90c71b7d60aa9f34a9ca29
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8I:bLy2Kerc64CiGImav42j0w
TLSH
T10B234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 fd4b05c365331d3fd1a96316f8fd9a690dc7a9c047f992ef7dbf34569270fb79
MD5 c8f2ff9588e546630ebc3c915a9687a3
SHA1 a36959f46a1957a3c3a5abefd5e0b8866e80e1bf
SHA512 956874eec1dd587fd9967261adf68c56d6aca43bb1b26aaf08992125683beb181500c8deb510a88a5c4db3df1fe10ef6ca3add7782fe80da9fa40035d3e9a7b8
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v81:bLy2Kerc64CiGImav42j0d
TLSH
T199234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2680-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2680-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4160-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4432-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4432-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads