juko | 2f7bbe33b1401b82fd331e294b84f9732b65b57ca7b5f63c86aeae467ab02eae

General

Target
2026-08-23_8d80fee34c483b00e4af834807ab2d4c_elex_wannacry.exe
Size 94KB
Sample260824-grbb8stbrc
SHA256 2f7bbe33b1401b82fd331e294b84f9732b65b57ca7b5f63c86aeae467ab02eae
MD5 8d80fee34c483b00e4af834807ab2d4c
SHA1 20fec6c36a78f23c3a305cf76607a2b0747556a1
SHA512 855a7c96e9662553aa866d8897abf8bdaa55579387df29f02483c61de206eea84c7b75e1e7c391f082f3a97237e70ca8717fabf77b3c65386fa71ca926cb4991
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Nr:RLy2Kerc64CiGImFYgUBWTb4/Nr
TLSH
T1A6937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/4244-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b1d0-5.dat	family_juko
behavioral2/memory/4244-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/1696-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c554-13.dat	family_juko
behavioral2/memory/632-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/632-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1696	WINWORD.exe
632	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
4792	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	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	2026-08-23_8d80fee34c483b00e4af834807ab2d4c_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
4792	cmd.exe
1716	PING.EXE
4460	PING.EXE
1748	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1748	PING.EXE
1716	PING.EXE
4460	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4244 wrote to memory of 1696	4244	2026-08-23_8d80fee34c483b00e4af834807ab2d4c_elex_wannacry.exe	89
PID 1696 wrote to memory of 4792	1696	WINWORD.exe	90
PID 4792 wrote to memory of 1716	4792	cmd.exe	92
PID 4792 wrote to memory of 4460	4792	cmd.exe	93
PID 4792 wrote to memory of 1748	4792	cmd.exe	94
PID 4792 wrote to memory of 632	4792	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-23_8d80fee34c483b00e4af834807ab2d4c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-23_8d80fee34c483b00e4af834807ab2d4c_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:1696
- - 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\0000574E" 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:4792
  - - 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:1716
  - - 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:4460
  - - 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:1748
  - - 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:632

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

0000574E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000574E
Size 94KB
SHA256 3401561abb31f0e623dc574054ba453cd4d7dd62f19560faa1910195cf3b8765
MD5 efba5326e00d142b6a6a97f4c0e6330e
SHA1 449db41bbb2d85988835c428f77f107c0c0c2fa9
SHA512 be4cc5a91bbb740bd117ae6324cbae839547e3c2bf32b125432f33fdf027ec92b4a6c40fc06a0d35875957a6dcbc1d613df29da26f819d3128abc96bd803f5f6
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N2:RLy2Kerc64CiGImFYgUBWTb4/N2
TLSH
T1DD937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 2f7bbe33b1401b82fd331e294b84f9732b65b57ca7b5f63c86aeae467ab02eae
MD5 8d80fee34c483b00e4af834807ab2d4c
SHA1 20fec6c36a78f23c3a305cf76607a2b0747556a1
SHA512 855a7c96e9662553aa866d8897abf8bdaa55579387df29f02483c61de206eea84c7b75e1e7c391f082f3a97237e70ca8717fabf77b3c65386fa71ca926cb4991
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Nr:RLy2Kerc64CiGImFYgUBWTb4/Nr
TLSH
T1A6937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/632-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/632-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1696-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4244-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4244-10-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads