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 8 IoCs

resource	yara_rule
behavioral1/memory/1748-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b000000024250-5.dat	family_juko
behavioral1/memory/1748-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2200-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2200-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024393-16.dat	family_juko
behavioral1/memory/2632-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2632-19-0x0000000000400000-0x0000000000420000-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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-08-02_c8f2ff9588e546630ebc3c915a9687a3_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2200	WINWORD.exe
2632	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-1-5-21-889581200-2041691093-2048517887-1000\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
4828	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	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
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
536	PING.EXE
1568	PING.EXE
4828	cmd.exe
3680	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
536	PING.EXE
1568	PING.EXE
3680	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1748 wrote to memory of 2200	1748	2026-08-02_c8f2ff9588e546630ebc3c915a9687a3_elex_wannacry.exe	84
PID 2200 wrote to memory of 4828	2200	WINWORD.exe	85
PID 4828 wrote to memory of 3680	4828	cmd.exe	87
PID 4828 wrote to memory of 536	4828	cmd.exe	89
PID 4828 wrote to memory of 1568	4828	cmd.exe	93
PID 4828 wrote to memory of 2632	4828	cmd.exe	96

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1748
- 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:2200
- - 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\00007B03" 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:4828
  - - 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:3680
  - - 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:536
  - - 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:1568
  - - 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:2632

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

00007B03

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007B03
Size 48KB
SHA256 06805c22a88d7626f2e30e05d9bba94f4f91702ad3de35d6d6a27d93ce969858
MD5 91ebec25fb1107a00a450bce5cf534a3
SHA1 24d27bc86ec6e13c6c2651b65e5494c27e71f98c
SHA512 c7f5e4f87751c5ec6e9f64b3270c881625ddae35344653ac7a5dc77ac799c47f29dc69490062a54679ba501baabf10e7a7cdec8b7289c67a4b6a61520cb93eef
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8S:bLy2Kerc64CiGImav42j06
TLSH
T10D234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/1748-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1748-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2200-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2200-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2632-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2632-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads