juko | daaabad4c3b03259f223367f2b749a242805ab911b55a3116793fe22ef9b84ae

General

Target
2026-10-19_80dd3991df101c44475f3a171c042084_elex_wannacry.exe
Size 48KB
Sample261020-seqryae14m
SHA256 daaabad4c3b03259f223367f2b749a242805ab911b55a3116793fe22ef9b84ae
MD5 80dd3991df101c44475f3a171c042084
SHA1 b937a2f184aefa9e7bd5c43512aa36c9e34d1101
SHA512 801aed9ca85216c7467207995dc83d700eb2815cee76e2c2a66ee189d55ef8512c67bd6ed2135595120afd080ad9196d9be139d51f656633574e6b27044345a9
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v88:bLy2Kerc64CiGImav42j0E
TLSH
T1FA234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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
behavioral1/memory/4980-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0017000000024201-4.dat	family_juko
behavioral1/memory/4980-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1276-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024309-15.dat	family_juko
behavioral1/memory/4964-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4964-19-0x0000000000400000-0x0000000000420000-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-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	2026-10-19_80dd3991df101c44475f3a171c042084_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1276	WINWORD.exe
4964	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-1-5-21-240542094-4193773837-3211495583-1000\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
3656	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\Domain	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-19_80dd3991df101c44475f3a171c042084_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
364	PING.EXE
2608	PING.EXE
3656	cmd.exe
408	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
408	PING.EXE
364	PING.EXE
2608	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4980 wrote to memory of 1276	4980	2026-10-19_80dd3991df101c44475f3a171c042084_elex_wannacry.exe	85
PID 1276 wrote to memory of 3656	1276	WINWORD.exe	86
PID 3656 wrote to memory of 408	3656	cmd.exe	88
PID 3656 wrote to memory of 364	3656	cmd.exe	89
PID 3656 wrote to memory of 2608	3656	cmd.exe	90
PID 3656 wrote to memory of 4964	3656	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-10-19_80dd3991df101c44475f3a171c042084_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-19_80dd3991df101c44475f3a171c042084_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4980
- 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:1276
- - 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\000070E4" 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:3656
  - - 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:408
  - - 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:364
  - - 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:2608
  - - 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:4964

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

000070E4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000070E4
Size 48KB
SHA256 5c230aef22c646f6a25dbdfdae3bee85533dd60ca7a070fad825fe83bcb5c31b
MD5 1acd0f926bd9c43af3b6d760510a8f01
SHA1 52b72388698783774aa997521d6527985a9f7cf1
SHA512 2d0403bbc2c41bce03363ef702e5335d5ee99ac7cd2a10f600866f39b7d216e3ed9537dc56b22aba9bfc9f601d8a98dccbb26c28e89c6c6b40240ecf4ac57964
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v83:bLy2Kerc64CiGImav42j0P
TLSH
T155234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 daaabad4c3b03259f223367f2b749a242805ab911b55a3116793fe22ef9b84ae
MD5 80dd3991df101c44475f3a171c042084
SHA1 b937a2f184aefa9e7bd5c43512aa36c9e34d1101
SHA512 801aed9ca85216c7467207995dc83d700eb2815cee76e2c2a66ee189d55ef8512c67bd6ed2135595120afd080ad9196d9be139d51f656633574e6b27044345a9
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v88:bLy2Kerc64CiGImav42j0E
TLSH
T1FA234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1276-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4964-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4964-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4980-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4980-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads