juko | 726ebe43f37009496bbcadb56addc3800b5e58037395f3fdc821d5030e83c031

General

Target
2026-10-01_a93de2f84ddfe8a417109568bfb16892_elex_wannacry.exe
Size 67KB
Sample261002-ham55svyev
SHA256 726ebe43f37009496bbcadb56addc3800b5e58037395f3fdc821d5030e83c031
MD5 a93de2f84ddfe8a417109568bfb16892
SHA1 73175d19fde4104fbd0f1e3c78f4acc8be59f6af
SHA512 143813ee41b290e5c7146df7572ba06269f9f4dbb948663d6a33b32528bfc2a0fbfa10d7d8f790ec8f501ad756e21f73acad12f47b7d9e11a0632738afef6ad1
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQJ:aLy2Kerc64CiGImRylFyp8TS
TLSH
T1BB633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
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 6 IoCs

resource	yara_rule
behavioral2/memory/1632-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000800000001b6e0-4.dat	family_juko
behavioral2/memory/1632-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4780-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001000000001c555-13.dat	family_juko
behavioral2/memory/4560-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4780	WINWORD.exe
4560	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-1-5-21-1404337215-1550464601-2805570857-1000\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
1964	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	2026-10-01_a93de2f84ddfe8a417109568bfb16892_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
1964	cmd.exe
4528	PING.EXE
5988	PING.EXE
3348	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5988	PING.EXE
3348	PING.EXE
4528	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1632 wrote to memory of 4780	1632	2026-10-01_a93de2f84ddfe8a417109568bfb16892_elex_wannacry.exe	89
PID 4780 wrote to memory of 1964	4780	WINWORD.exe	90
PID 1964 wrote to memory of 4528	1964	cmd.exe	92
PID 1964 wrote to memory of 5988	1964	cmd.exe	93
PID 1964 wrote to memory of 3348	1964	cmd.exe	94
PID 1964 wrote to memory of 4560	1964	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-01_a93de2f84ddfe8a417109568bfb16892_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-01_a93de2f84ddfe8a417109568bfb16892_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1632
- 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:4780
- - 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\00007930" 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:1964
  - - 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:4528
  - - 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:5988
  - - 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:3348
  - - 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:4560

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

00007930

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007930
Size 67KB
SHA256 dffc1b98d3b9f491637f1b74594e60d713fbdbe841181b3986f1278a92862a58
MD5 7e1b6077d016b6e58c766d5ccac50592
SHA1 6d361417810997e42f68273d0f6a6e345eda807e
SHA512 2740ac86e8b39dd9a56fcbbf4d7f52d2680fc4a26e9f6e140ae1302a67e5b0f7c82f71405655ead46f33bd38eb8c078f75cb0191055748817323f7db98e539ee
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQp:aLy2Kerc64CiGImRylFyp8TS
TLSH
T13C633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 67KB
SHA256 726ebe43f37009496bbcadb56addc3800b5e58037395f3fdc821d5030e83c031
MD5 a93de2f84ddfe8a417109568bfb16892
SHA1 73175d19fde4104fbd0f1e3c78f4acc8be59f6af
SHA512 143813ee41b290e5c7146df7572ba06269f9f4dbb948663d6a33b32528bfc2a0fbfa10d7d8f790ec8f501ad756e21f73acad12f47b7d9e11a0632738afef6ad1
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQJ:aLy2Kerc64CiGImRylFyp8TS
TLSH
T1BB633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1632-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1632-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4560-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4780-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads