juko | d505e0af0bffedb9223dc978b969d0184eb50586439c7d5b98d6bc27056d435c

General

Target
2026-08-12_d85aebb1a11afe79a3e71511d7100d29_elex_wannacry.exe
Size 87KB
Sample260813-aa38csvygx
SHA256 d505e0af0bffedb9223dc978b969d0184eb50586439c7d5b98d6bc27056d435c
MD5 d85aebb1a11afe79a3e71511d7100d29
SHA1 a80af1a098bd95c37a0a4994a4e341af09433bab
SHA512 49274de0c67f4452deaed6096a476e22ca8d70a42c062333dbab20592013d1cddf15e1f2ab76260418327184fe39a3b7ab353dee455c7f394dc4e3e296c2596b
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpy:2Ly2Kerc64CiGIm1K851YO6EQkwpy
TLSH
T13593A1763A259190C48BD138E8155AA0B932DCF52FF71303E7417AAC59B1E13CFAE8C6
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/5568-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b87d-5.dat	family_juko
behavioral2/memory/5568-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5812-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c53a-13.dat	family_juko
behavioral2/memory/3684-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3684-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5812	WINWORD.exe
3684	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-1-5-21-3797332335-34111092-3597280141-1000\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
5108	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-12_d85aebb1a11afe79a3e71511d7100d29_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
5108	cmd.exe
2436	PING.EXE
3084	PING.EXE
5188	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2436	PING.EXE
3084	PING.EXE
5188	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5568 wrote to memory of 5812	5568	2026-08-12_d85aebb1a11afe79a3e71511d7100d29_elex_wannacry.exe	89
PID 5812 wrote to memory of 5108	5812	WINWORD.exe	90
PID 5108 wrote to memory of 2436	5108	cmd.exe	92
PID 5108 wrote to memory of 3084	5108	cmd.exe	93
PID 5108 wrote to memory of 5188	5108	cmd.exe	94
PID 5108 wrote to memory of 3684	5108	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-12_d85aebb1a11afe79a3e71511d7100d29_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-12_d85aebb1a11afe79a3e71511d7100d29_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5568
- 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:5812
- - 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\000048DE" 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:5108
  - - 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:2436
  - - 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:3084
  - - 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:5188
  - - 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:3684

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

000048DE

Path C:\Users\Admin\AppData\Roaming\Mozilla\000048DE
Size 87KB
SHA256 6dd7633ec9d4cb52e720fa87274dc529f461dc726c0acd9da4b8b3468aec4228
MD5 71ef62c8832deef2cb862c0133124c3f
SHA1 9b3ddcd33e916399ff7182cf053782a1c8e0d92b
SHA512 00027490a0428742b6ffb0a91ebbc025d32e05bcc7a76126a687921e6fff718710edfae03cb16f8c4a9582418f34e9450b0f0fb45eea468c6bec704d67484102
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwph:2Ly2Kerc64CiGIm1K851YO6EQkwph
TLSH
T1B093A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 d505e0af0bffedb9223dc978b969d0184eb50586439c7d5b98d6bc27056d435c
MD5 d85aebb1a11afe79a3e71511d7100d29
SHA1 a80af1a098bd95c37a0a4994a4e341af09433bab
SHA512 49274de0c67f4452deaed6096a476e22ca8d70a42c062333dbab20592013d1cddf15e1f2ab76260418327184fe39a3b7ab353dee455c7f394dc4e3e296c2596b
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpy:2Ly2Kerc64CiGIm1K851YO6EQkwpy
TLSH
T13593A1763A259190C48BD138E8155AA0B932DCF52FF71303E7417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3684-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3684-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5568-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5568-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5812-12-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads