juko | 258a49494cc2c56b6eb90c08d978cf3e87047650031318d9ab4d639bd5792df3

General

Target
2026-10-10_ccde931d0600eb672e3e20b64b66a7b0_elex_wannacry.exe
Size 86KB
Sample261011-cfy7pstyfx
SHA256 258a49494cc2c56b6eb90c08d978cf3e87047650031318d9ab4d639bd5792df3
MD5 ccde931d0600eb672e3e20b64b66a7b0
SHA1 756d1aa45a6f0242977cca886bd7fab1ca2eb7fe
SHA512 d77e71371867863a6ccd5cac1d423f29de3f35fbc4777c1a4618ecc3e2b5cedcedfeb291a26a12443527c40771a384753d019254a15ea534e69a024169aba1b1
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpy:vLy2Kerc64CiGImMPu/ouEQkwpy
TLSH
T18A83C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
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/1200-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000800000001b6e7-4.dat	family_juko
behavioral2/memory/1200-10-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4968-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c4ea-13.dat	family_juko
behavioral2/memory/3312-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3312-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4968	WINWORD.exe
3312	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-1-5-21-1704430598-3087477806-3297458608-1000\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
1588	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	2026-10-10_ccde931d0600eb672e3e20b64b66a7b0_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
1588	cmd.exe
5484	PING.EXE
2624	PING.EXE
2460	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2624	PING.EXE
2460	PING.EXE
5484	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1200 wrote to memory of 4968	1200	2026-10-10_ccde931d0600eb672e3e20b64b66a7b0_elex_wannacry.exe	89
PID 4968 wrote to memory of 1588	4968	WINWORD.exe	90
PID 1588 wrote to memory of 5484	1588	cmd.exe	92
PID 1588 wrote to memory of 2624	1588	cmd.exe	93
PID 1588 wrote to memory of 2460	1588	cmd.exe	94
PID 1588 wrote to memory of 3312	1588	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-10_ccde931d0600eb672e3e20b64b66a7b0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-10_ccde931d0600eb672e3e20b64b66a7b0_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1200
- 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:4968
- - 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\00005F96" 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:1588
  - - 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:5484
  - - 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:2624
  - - 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:2460
  - - 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:3312

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

00005F96

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005F96
Size 86KB
SHA256 b5e01d2ee61a3970e6ca766679f2b621f600cd47575e7225cf61ef2cb9cf8ed4
MD5 0a62bae43b1e4ce58da7ab75313201b0
SHA1 822643c2c8e339a06fd0b798cfe6fb8ad0ba0e76
SHA512 86c0fdf0e4d272bd4bef6cff7658d284ea08e8f8372611809af5769b460affacdf40f9aa8de64af9af64b6ef9d84f6236550cc426bd5e245dce426baf3dce155
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpF:vLy2Kerc64CiGImMPu/ouEQkwpF
TLSH
T13983C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 86KB
SHA256 258a49494cc2c56b6eb90c08d978cf3e87047650031318d9ab4d639bd5792df3
MD5 ccde931d0600eb672e3e20b64b66a7b0
SHA1 756d1aa45a6f0242977cca886bd7fab1ca2eb7fe
SHA512 d77e71371867863a6ccd5cac1d423f29de3f35fbc4777c1a4618ecc3e2b5cedcedfeb291a26a12443527c40771a384753d019254a15ea534e69a024169aba1b1
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpy:vLy2Kerc64CiGImMPu/ouEQkwpy
TLSH
T18A83C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1200-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1200-10-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/3312-16-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/3312-17-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/4968-12-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads