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
behavioral2/memory/5580-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0007000000016b39-4.dat	family_juko
behavioral2/memory/5580-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3020-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001600000001c34f-13.dat	family_juko
behavioral2/memory/260-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/260-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3020	WINWORD.exe
260	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-1-5-21-1704430598-3087477806-3297458608-1000\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
3248	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	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

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
4484	PING.EXE
4700	PING.EXE
304	PING.EXE
3248	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
304	PING.EXE
4484	PING.EXE
4700	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5580 wrote to memory of 3020	5580	2026-10-19_80dd3991df101c44475f3a171c042084_elex_wannacry.exe	89
PID 3020 wrote to memory of 3248	3020	WINWORD.exe	90
PID 3248 wrote to memory of 4484	3248	cmd.exe	92
PID 3248 wrote to memory of 4700	3248	cmd.exe	93
PID 3248 wrote to memory of 304	3248	cmd.exe	94
PID 3248 wrote to memory of 260	3248	cmd.exe	95

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5580
- 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:3020
- - 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\00004ECE" 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:3248
  - - 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:4484
  - - 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:4700
  - - 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:304
  - - 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:260

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

00004ECE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004ECE
Size 48KB
SHA256 915fcc64b0f9b859fd3962be8b9246278aa0c025cb12163e031790d9759285fd
MD5 4baa2a9b56ac7b72fab1e1bcb426ec20
SHA1 8eb09ffd2a419df4695af85c97e26b46c33b2d3d
SHA512 e6f72f2307e20fcd881cbe013bebfeca1227219db96454dd795583a266305fd15602ac3c22086034c3a2e557000c1f72f1afe17f475473d80c2fb82999bbfcad
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v88:bLy2Kerc64CiGImav42j0k
TLSH
T1AE234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

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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/260-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/260-17-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3020-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5580-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5580-9-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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