juko | 20b335d3812ccbaaf44ec98fa011d6dee4e6d2d6126e9450f1eb95a64fcd0016

General

Target
2026-10-25_bd93571979992fd4c762172999f9b7c4_elex_wannacry.exe
Size 49KB
Sample261026-rb7evabc42
SHA256 20b335d3812ccbaaf44ec98fa011d6dee4e6d2d6126e9450f1eb95a64fcd0016
MD5 bd93571979992fd4c762172999f9b7c4
SHA1 bbfa7f7daf4e79088c20f7879e7291a900b2ad7f
SHA512 1805ef2383183f6921b4bdbd2a5651563f76a90fdbb0a48939f70fc2d66e8a174c4d60f50a8abd807dc1e135305408477f4ab815bd78b42aed97622788156da2
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2I:VLy2Kerc64CiGImVu8p4kojWh2I
TLSH
T163334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/5712-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0010000000023385-4.dat	family_juko
behavioral1/memory/4836-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5712-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4836-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000024550-16.dat	family_juko
behavioral1/memory/1884-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1884-20-0x0000000000400000-0x0000000000420000-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-1-5-21-2091445952-3649787497-104050984-1000\Control Panel\International\Geo\Nation	2026-10-25_bd93571979992fd4c762172999f9b7c4_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4836	WINWORD.exe
1884	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-1-5-21-2091445952-3649787497-104050984-1000\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
1960	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-25_bd93571979992fd4c762172999f9b7c4_elex_wannacry.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
5196	PING.EXE
4420	PING.EXE
5952	PING.EXE
1960	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5196	PING.EXE
4420	PING.EXE
5952	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5712 wrote to memory of 4836	5712	2026-10-25_bd93571979992fd4c762172999f9b7c4_elex_wannacry.exe	84
PID 4836 wrote to memory of 1960	4836	WINWORD.exe	85
PID 1960 wrote to memory of 5196	1960	cmd.exe	87
PID 1960 wrote to memory of 4420	1960	cmd.exe	90
PID 1960 wrote to memory of 5952	1960	cmd.exe	93
PID 1960 wrote to memory of 1884	1960	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-10-25_bd93571979992fd4c762172999f9b7c4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-25_bd93571979992fd4c762172999f9b7c4_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5712
- 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:4836
- - 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\00002379" 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:1960
  - - 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:5196
  - - 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:4420
  - - 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:5952
  - - 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:1884

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

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Downloads

00002379

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002379
Size 49KB
SHA256 836e9d15edeb92568b111716122f2a27b2ae6bc6b2c0642271c2b31859a8a6fd
MD5 b56eb7b0b4b2733d9a59d538c8c6d11a
SHA1 28b7d48f2a9349a36091e5f848529be578a5d1b7
SHA512 239741bf754ddf7cc235dd95e8cce8eae7b8027c34a4207d9abac79a01127be4ad6bc1880717580df50e9f89f5e1e54a63847802df9d90941ead44a15a99ed46
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2M:VLy2Kerc64CiGImVu8p4kojWh2M
TLSH
T1D9334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 20b335d3812ccbaaf44ec98fa011d6dee4e6d2d6126e9450f1eb95a64fcd0016
MD5 bd93571979992fd4c762172999f9b7c4
SHA1 bbfa7f7daf4e79088c20f7879e7291a900b2ad7f
SHA512 1805ef2383183f6921b4bdbd2a5651563f76a90fdbb0a48939f70fc2d66e8a174c4d60f50a8abd807dc1e135305408477f4ab815bd78b42aed97622788156da2
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2I:VLy2Kerc64CiGImVu8p4kojWh2I
TLSH
T163334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1884-19-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/1884-20-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4836-11-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4836-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5712-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5712-13-0x0000000000400000-0x0000000000420000-memory.dmp

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Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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