juko | 5cf2e3ab6e80beaef1e414c1edabbe22cb797ca29b689eb4d6bdd92727c4d0e4

General

Target
2026-10-16_79ea29e6b261a08677469b63d131f8b0_elex_wannacry.exe
Size 70KB
Sample261017-rcpanafc69
SHA256 5cf2e3ab6e80beaef1e414c1edabbe22cb797ca29b689eb4d6bdd92727c4d0e4
MD5 79ea29e6b261a08677469b63d131f8b0
SHA1 8907b05c1e07ae57860fb5f02470a4785dbe5fab
SHA512 d552218c9b94ebeb2aaa67bc8c30df5bba212ef034280d5a4260263d135896730883428134943d8cb00fb10038d6c2af1366969a88e0cce910a28839f14848d6
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYOk:vLy2Kerc64CiGImVuX/N81rRLoD51YOk
TLSH
T17A633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
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/4244-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000a000000019cb3-4.dat	family_juko
behavioral2/memory/4244-9-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/3420-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c585-13.dat	family_juko
behavioral2/memory/4768-16-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3420	WINWORD.exe
4768	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-1-5-21-53044966-3830981193-2402648431-1000\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
4956	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	2026-10-16_79ea29e6b261a08677469b63d131f8b0_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
4956	cmd.exe
2876	PING.EXE
4524	PING.EXE
2492	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2876	PING.EXE
4524	PING.EXE
2492	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4244 wrote to memory of 3420	4244	2026-10-16_79ea29e6b261a08677469b63d131f8b0_elex_wannacry.exe	90
PID 3420 wrote to memory of 4956	3420	WINWORD.exe	91
PID 4956 wrote to memory of 2876	4956	cmd.exe	93
PID 4956 wrote to memory of 4524	4956	cmd.exe	94
PID 4956 wrote to memory of 2492	4956	cmd.exe	95
PID 4956 wrote to memory of 4768	4956	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-16_79ea29e6b261a08677469b63d131f8b0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-16_79ea29e6b261a08677469b63d131f8b0_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4244
- 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:3420
- - 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\00002385" 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:4956
  - - 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:2876
  - - 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:4524
  - - 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:2492
  - - 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:4768

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

00002385

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002385
Size 70KB
SHA256 1e59ece834240f1845a0123825ba820f1991c1697f459338f8193fb2bf5b9775
MD5 d210a4f034859f000c2b65c41dd05e78
SHA1 36b8a2cb078d1352e3d2f6612ba18ca3d0349d59
SHA512 dbc62b2255d6794de0161bd9468fa9dbd637e52cc32ce97026047fedf6cf818cb9a4116b20533f4cede379b16fc89c955572d9473fa6248d83f20626c1dd00a4
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYOG:vLy2Kerc64CiGImVuX/N81rRLoD51YOG
TLSH
T18E633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 70KB
SHA256 5cf2e3ab6e80beaef1e414c1edabbe22cb797ca29b689eb4d6bdd92727c4d0e4
MD5 79ea29e6b261a08677469b63d131f8b0
SHA1 8907b05c1e07ae57860fb5f02470a4785dbe5fab
SHA512 d552218c9b94ebeb2aaa67bc8c30df5bba212ef034280d5a4260263d135896730883428134943d8cb00fb10038d6c2af1366969a88e0cce910a28839f14848d6
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYOk:vLy2Kerc64CiGImVuX/N81rRLoD51YOk
TLSH
T17A633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3420-12-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/4244-0-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/4244-9-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/4768-16-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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