juko | b7a45043961fed139e7e569384226742fc4aab65062b2c202439e9d47e0a4a1f

General

Target
2026-10-01_57d0720c28e2832a5a0f3b3295243c57_elex_wannacry.exe
Size 115KB
Sample261002-rmx1jszcpc
SHA256 b7a45043961fed139e7e569384226742fc4aab65062b2c202439e9d47e0a4a1f
MD5 57d0720c28e2832a5a0f3b3295243c57
SHA1 088bbfba20b7d695248cace265bdfb75e1f3fdd4
SHA512 7d4011c2d75cf9c33655d84a2a31d903d87e4a48f40acd905dea1028115b02d2aa790baa8c60caf179192a2157a2ba04a24b1ebbabc8f87a296e064a94746a68
SSDEEP 3072:vLy2Kerc64CiGImVuX/N81rRLoPshIPFJRAhP2EAeki:vLy2Kwc64YIweIFsDePf
TLSH
T1F4B3AE06FBDC4F91F44A0970CA7B0A74607D6CB55527E22BB380361E2D72B529F23A9D
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/5664-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000700000001b867-4.dat	family_juko
behavioral2/memory/5664-10-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/4524-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c629-13.dat	family_juko
behavioral2/memory/3692-16-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4524	WINWORD.exe
3692	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-1-5-21-650287814-2715975232-1279715623-1000\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
796	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	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_57d0720c28e2832a5a0f3b3295243c57_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

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
796	cmd.exe
4708	PING.EXE
2748	PING.EXE
2520	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4708	PING.EXE
2748	PING.EXE
2520	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5664 wrote to memory of 4524	5664	2026-10-01_57d0720c28e2832a5a0f3b3295243c57_elex_wannacry.exe	89
PID 4524 wrote to memory of 796	4524	WINWORD.exe	90
PID 796 wrote to memory of 4708	796	cmd.exe	92
PID 796 wrote to memory of 2748	796	cmd.exe	93
PID 796 wrote to memory of 2520	796	cmd.exe	94
PID 796 wrote to memory of 3692	796	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-01_57d0720c28e2832a5a0f3b3295243c57_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-01_57d0720c28e2832a5a0f3b3295243c57_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5664
- 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:4524
- - 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\00007B4A" 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:796
  - - 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:4708
  - - 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:2748
  - - 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:2520
  - - 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:3692

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

00007B4A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007B4A
Size 115KB
SHA256 dfed557befa3dc9c8f516fa6b1b924a3db86419ebd3f01bb07ff27b89bdef9df
MD5 bf67618b5033da4bd82bc2db69da4ced
SHA1 e2765cbd16175da146cfc15e8600d2d4810c5900
SHA512 291b2e5728297ac344db71bf2d78cf697d3a277e4471f932e760610309d0d639230f93b6e65fcb5d631204006d8d63cad4d89f44d8dfd595a32cbbd701b55b9e
SSDEEP 3072:vLy2Kerc64CiGImVuX/N81rRLoPshIPFJRAhP2EAeko:vLy2Kwc64YIweIFsDeP1
TLSH
T1F6B3AE06FBDC4F91F44A0970CA7B0A74607D6CB55527E22BB380361E2D72B529F23A9D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 115KB
SHA256 b7a45043961fed139e7e569384226742fc4aab65062b2c202439e9d47e0a4a1f
MD5 57d0720c28e2832a5a0f3b3295243c57
SHA1 088bbfba20b7d695248cace265bdfb75e1f3fdd4
SHA512 7d4011c2d75cf9c33655d84a2a31d903d87e4a48f40acd905dea1028115b02d2aa790baa8c60caf179192a2157a2ba04a24b1ebbabc8f87a296e064a94746a68
SSDEEP 3072:vLy2Kerc64CiGImVuX/N81rRLoPshIPFJRAhP2EAeki:vLy2Kwc64YIweIFsDePf
TLSH
T1F4B3AE06FBDC4F91F44A0970CA7B0A74607D6CB55527E22BB380361E2D72B529F23A9D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3692-16-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/4524-12-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/5664-0-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/5664-10-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads