juko | 3d1890f95678e01595f696df6a72f0857a9d04d77bc71febd1a7daf94cced992

General

Target
2026-08-25_67d15b9053a0b8e07d6372cfd9133a20_elex_wannacry.exe
Size 39KB
Sample260826-2rv2vsbr4y
SHA256 3d1890f95678e01595f696df6a72f0857a9d04d77bc71febd1a7daf94cced992
MD5 67d15b9053a0b8e07d6372cfd9133a20
SHA1 9301678c7f2046dc5e767d795eb6f6839fba25c5
SHA512 f710e451fc6fd7d6989dea489a052ce200ec4231e569c7b5154b74083b3805dfcb32de19abb3a75e613d5d32c4d6b1b0e809ce24e9f5c3797eae04359e6cc4eb
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBW:aLsF2Kerc64sTiX2IV0DVyIGFp
TLSH
T1B8036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/2380-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000a000000019ca4-5.dat	family_juko
behavioral2/memory/2380-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1432-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c489-13.dat	family_juko
behavioral2/memory/260-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/260-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1432	WINWORD.exe
260	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-1-5-21-2115213192-531537726-3295841909-1000\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
4880	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	2026-08-25_67d15b9053a0b8e07d6372cfd9133a20_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
4344	PING.EXE
52	PING.EXE
4880	cmd.exe
5240	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5240	PING.EXE
4344	PING.EXE
52	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2380 wrote to memory of 1432	2380	2026-08-25_67d15b9053a0b8e07d6372cfd9133a20_elex_wannacry.exe	89
PID 1432 wrote to memory of 4880	1432	WINWORD.exe	90
PID 4880 wrote to memory of 5240	4880	cmd.exe	92
PID 4880 wrote to memory of 4344	4880	cmd.exe	93
PID 4880 wrote to memory of 52	4880	cmd.exe	94
PID 4880 wrote to memory of 260	4880	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-25_67d15b9053a0b8e07d6372cfd9133a20_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-25_67d15b9053a0b8e07d6372cfd9133a20_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2380
- 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:1432
- - 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\00002E5C" 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:4880
  - - 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:5240
  - - 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:4344
  - - 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:52
  - - 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:260

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

Replay Monitor

Loading Replay Monitor...

Downloads

00002E5C

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002E5C
Size 39KB
SHA256 772adfabd5ba82d5fea7fcbb971051a0984f586ec0e1b53596c14f62f366489d
MD5 caa3afb9879dbb80537d497c1080d176
SHA1 59409bb07303f59e8f2285749286fb9aa5e997b6
SHA512 83f0326f73229c361e3d16edc3d34d3fd7b7ac03b9bcfd6c7844295b6b6d5fbe897fe03d0559bd6ad8d6c65282e04e93690bc2d23b23831ce327672f861a47aa
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBr:aLsF2Kerc64sTiX2IV0DVyIGFQ
TLSH
T180035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 3d1890f95678e01595f696df6a72f0857a9d04d77bc71febd1a7daf94cced992
MD5 67d15b9053a0b8e07d6372cfd9133a20
SHA1 9301678c7f2046dc5e767d795eb6f6839fba25c5
SHA512 f710e451fc6fd7d6989dea489a052ce200ec4231e569c7b5154b74083b3805dfcb32de19abb3a75e613d5d32c4d6b1b0e809ce24e9f5c3797eae04359e6cc4eb
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBW:aLsF2Kerc64sTiX2IV0DVyIGFp
TLSH
T1B8036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/260-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/260-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1432-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2380-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2380-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads