juko | 99c95e6471216877c0b97b9b6fa4362f5cc231a75dc6260c7be6efea933d72ec

General

Target
2026-10-28_939f052859730e8b160af9592daedb35_elex_wannacry.exe
Size 57KB
Sample261029-3dctssgz4m
SHA256 99c95e6471216877c0b97b9b6fa4362f5cc231a75dc6260c7be6efea933d72ec
MD5 939f052859730e8b160af9592daedb35
SHA1 d2f781a93aa6607c72b8e29005d656221c9ec4d9
SHA512 704f2682a086cade9359718bd769cb7ba29a829adb96aa8c1ef2607bcc487aebc274dcc67851f943752ca0323b6cb6313860d9ecc702335f2e9f9a61004653f6
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQW:qLy2Kerc64CiGImklNUyp8TF
TLSH
T1C1433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/5104-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000b00000001b302-4.dat	family_juko
behavioral2/memory/5104-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/1792-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c5b1-13.dat	family_juko
behavioral2/memory/2536-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/2536-18-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1792	WINWORD.exe
2536	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-1-5-21-696679853-3915825385-3233721679-1000\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
2476	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	2026-10-28_939f052859730e8b160af9592daedb35_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
236	PING.EXE
5628	PING.EXE
5744	PING.EXE
2476	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
236	PING.EXE
5628	PING.EXE
5744	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5104 wrote to memory of 1792	5104	2026-10-28_939f052859730e8b160af9592daedb35_elex_wannacry.exe	89
PID 1792 wrote to memory of 2476	1792	WINWORD.exe	90
PID 2476 wrote to memory of 236	2476	cmd.exe	92
PID 2476 wrote to memory of 5628	2476	cmd.exe	93
PID 2476 wrote to memory of 5744	2476	cmd.exe	94
PID 2476 wrote to memory of 2536	2476	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-28_939f052859730e8b160af9592daedb35_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-28_939f052859730e8b160af9592daedb35_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5104
- 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:1792
- - 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\00006AB7" 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:2476
  - - 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:236
  - - 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:5628
  - - 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:5744
  - - 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:2536

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:4508

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

00006AB7

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006AB7
Size 57KB
SHA256 197c5e54c8e701caa8319490de1c10ad58deb4b29f4d95571d6256229f8a25b5
MD5 a4fbd5c347c60302e5fea214f71740d1
SHA1 bb803785b1adef6ad411c0106cdd98024ab98169
SHA512 210d25bd6249e1e3711111172ccbb418478e9b445248d785496863524cd9edf4c0f0c2abd9a4df0bc2de6ab593c8e98119c48243824c10da1fcbe922d87277cb
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQp:qLy2Kerc64CiGImklNUyp8TW
TLSH
T10E433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 99c95e6471216877c0b97b9b6fa4362f5cc231a75dc6260c7be6efea933d72ec
MD5 939f052859730e8b160af9592daedb35
SHA1 d2f781a93aa6607c72b8e29005d656221c9ec4d9
SHA512 704f2682a086cade9359718bd769cb7ba29a829adb96aa8c1ef2607bcc487aebc274dcc67851f943752ca0323b6cb6313860d9ecc702335f2e9f9a61004653f6
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQW:qLy2Kerc64CiGImklNUyp8TF
TLSH
T1C1433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1792-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2536-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2536-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5104-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5104-10-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads