juko | 63b7c9fea646dbae3f06974d0bbd1b74c0ae5b8f0f319cc0bfea72358c6dc9bd

General

Target
2026-10-28_7a5f27ec26b6fcf2d36065cfed456b50_elex_wannacry.exe
Size 48KB
Sample261030-bwl2msvx2q
SHA256 63b7c9fea646dbae3f06974d0bbd1b74c0ae5b8f0f319cc0bfea72358c6dc9bd
MD5 7a5f27ec26b6fcf2d36065cfed456b50
SHA1 956e6810dbab1b114d164dffd7315afe0065baed
SHA512 f28e197fa10928b879a7a70481692cc8673bdee1715d9ba32ef2d024373aa040867f3ec6023085480900feb380f552316e2547b2e779c298c2672fe14b5e4d46
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8d:bLy2Kerc64CiGImav42j0F
TLSH
T112234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/4788-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b00000002429a-4.dat	family_juko
behavioral1/memory/3204-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4788-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3204-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000900000002437f-16.dat	family_juko
behavioral1/memory/3844-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3844-20-0x0000000000400000-0x0000000000420000-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	2026-10-28_7a5f27ec26b6fcf2d36065cfed456b50_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
3204	WINWORD.exe
3844	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
1948	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-28_7a5f27ec26b6fcf2d36065cfed456b50_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

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
1948	cmd.exe
4808	PING.EXE
5008	PING.EXE
2348	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4808	PING.EXE
5008	PING.EXE
2348	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4788 wrote to memory of 3204	4788	2026-10-28_7a5f27ec26b6fcf2d36065cfed456b50_elex_wannacry.exe	83
PID 3204 wrote to memory of 1948	3204	WINWORD.exe	84
PID 1948 wrote to memory of 4808	1948	cmd.exe	86
PID 1948 wrote to memory of 5008	1948	cmd.exe	89
PID 1948 wrote to memory of 2348	1948	cmd.exe	92
PID 1948 wrote to memory of 3844	1948	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-10-28_7a5f27ec26b6fcf2d36065cfed456b50_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-28_7a5f27ec26b6fcf2d36065cfed456b50_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4788
- 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:3204
- - 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\000052C1" 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:1948
  - - 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:4808
  - - 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:5008
  - - 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:2348
  - - 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:3844

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

000052C1

Path C:\Users\Admin\AppData\Roaming\Mozilla\000052C1
Size 48KB
SHA256 eadeeaa5daac259c17e6de746ba7f968ea9ca293959aace704e3d46cd1345e3c
MD5 34c5a00f85afa3d1fa72b2ddc0fbe734
SHA1 f7340a3943e7277c21376a2b63f90fc85b4b2c09
SHA512 e49efe78c1f74c3f9706a8f7d6a68477d3b57e1a6ca213a7c086974493ec0ab9348957ad7446cbb542e8be7d74da5af1ac47dc4906db04f7d812445817bbfb25
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8C:bLy2Kerc64CiGImav42j06
TLSH
T17A234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 63b7c9fea646dbae3f06974d0bbd1b74c0ae5b8f0f319cc0bfea72358c6dc9bd
MD5 7a5f27ec26b6fcf2d36065cfed456b50
SHA1 956e6810dbab1b114d164dffd7315afe0065baed
SHA512 f28e197fa10928b879a7a70481692cc8673bdee1715d9ba32ef2d024373aa040867f3ec6023085480900feb380f552316e2547b2e779c298c2672fe14b5e4d46
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8d:bLy2Kerc64CiGImav42j0F
TLSH
T112234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3204-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3204-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3844-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3844-20-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4788-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4788-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads