juko | cb58f387b3918c5fdf85023f683c5557dc01dd36b1db16ba8518db1cccc0f9fd

General

Target
2026-08-08_583ac7cf3b64473df9ae2b996b370299_elex_wannacry.exe
Size 67KB
Sample260808-kvarnatcpd
SHA256 cb58f387b3918c5fdf85023f683c5557dc01dd36b1db16ba8518db1cccc0f9fd
MD5 583ac7cf3b64473df9ae2b996b370299
SHA1 9429b5bd228a0e561ff0cc0794b7dee903f5f56b
SHA512 563927248ae3a99cf1e10b5f6bfd7edf713b19c95b86d5e70505b1a9dfad3cb02c3a437bc1dfa7a453fc2c6f88eed304ff5d377ace8666012d647822a3293959
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQ9:aLy2Kerc64CiGImRylFyp8TG
TLSH
T166633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
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/3824-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/3824-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4284-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c56c-13.dat	family_juko
behavioral2/memory/2428-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4284	WINWORD.exe
2428	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-1-5-21-1738198120-2966725515-3980530802-1000\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
1604	cmd.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	2026-08-08_583ac7cf3b64473df9ae2b996b370299_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
1212	PING.EXE
1604	cmd.exe
2964	PING.EXE
2396	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2964	PING.EXE
2396	PING.EXE
1212	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3824 wrote to memory of 4284	3824	2026-08-08_583ac7cf3b64473df9ae2b996b370299_elex_wannacry.exe	89
PID 4284 wrote to memory of 1604	4284	WINWORD.exe	90
PID 1604 wrote to memory of 2964	1604	cmd.exe	92
PID 1604 wrote to memory of 2396	1604	cmd.exe	93
PID 1604 wrote to memory of 1212	1604	cmd.exe	94
PID 1604 wrote to memory of 2428	1604	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_583ac7cf3b64473df9ae2b996b370299_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_583ac7cf3b64473df9ae2b996b370299_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3824
- 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:4284
- - 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\000035EF" 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:1604
  - - 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:2964
  - - 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:2396
  - - 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:1212
  - - 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
      System Location Discovery: System Language Discovery
      PID:2428

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000035EF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000035EF
Size 67KB
SHA256 39169c980f6bd673255f3b03aea98d520ffdcdc74576c1e4d6e6c564d2607855
MD5 9186ece18695d04064e6f723cc351b04
SHA1 5b8d03ba15175c2dd07b36a6c2ee25a17767f912
SHA512 6cd5394a71a0cd28e8e578f084f3d799c786496140c88ce60076786b2a5b27375a7232ebbdd1e5986e86d6fc16591eec8531a949f60d1bb33c050aaf09b6d70c
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQl:aLy2Kerc64CiGImRylFyp8TS
TLSH
T1D5634B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 67KB
SHA256 cb58f387b3918c5fdf85023f683c5557dc01dd36b1db16ba8518db1cccc0f9fd
MD5 583ac7cf3b64473df9ae2b996b370299
SHA1 9429b5bd228a0e561ff0cc0794b7dee903f5f56b
SHA512 563927248ae3a99cf1e10b5f6bfd7edf713b19c95b86d5e70505b1a9dfad3cb02c3a437bc1dfa7a453fc2c6f88eed304ff5d377ace8666012d647822a3293959
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQ9:aLy2Kerc64CiGImRylFyp8TG
TLSH
T166633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2428-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3824-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3824-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4284-12-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads