juko | af6460974735efa3795abe021610fda66545685a596635f6a07e75eeea85e06c

General

Target
2026-08-24_14a3735d4398e1a467223aa4ce072810_elex_wannacry.exe
Size 48KB
Sample260825-xa78msdn6y
SHA256 af6460974735efa3795abe021610fda66545685a596635f6a07e75eeea85e06c
MD5 14a3735d4398e1a467223aa4ce072810
SHA1 c29bdba38f937004f6e9e21c79b74c9e44b93321
SHA512 399204b969224cb88c1da8380171b43bbbb6f3cad4fee569c66b8cb69fe0cbe7691065bf6e3255be61dc4b2ed2b6b4f36fc2a18c7ebd9e9815bdc3aa3ed18374
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v89:bLy2Kerc64CiGImav42j0l
TLSH
T184234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/5532-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000800000001b884-5.dat	family_juko
behavioral2/memory/5532-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3836-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c55d-13.dat	family_juko
behavioral2/memory/1876-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1876-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3836	WINWORD.exe
1876	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-1-5-21-552508041-2681165170-3229858294-1000\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
5952	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	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	2026-08-24_14a3735d4398e1a467223aa4ce072810_elex_wannacry.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
4940	PING.EXE
3056	PING.EXE
4216	PING.EXE
5952	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4940	PING.EXE
3056	PING.EXE
4216	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5532 wrote to memory of 3836	5532	2026-08-24_14a3735d4398e1a467223aa4ce072810_elex_wannacry.exe	89
PID 3836 wrote to memory of 5952	3836	WINWORD.exe	90
PID 5952 wrote to memory of 4940	5952	cmd.exe	92
PID 5952 wrote to memory of 3056	5952	cmd.exe	93
PID 5952 wrote to memory of 4216	5952	cmd.exe	94
PID 5952 wrote to memory of 1876	5952	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-24_14a3735d4398e1a467223aa4ce072810_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-24_14a3735d4398e1a467223aa4ce072810_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5532
- 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:3836
- - 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\00001B05" 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:5952
  - - 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:4940
  - - 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:3056
  - - 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:4216
  - - 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:1876

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

00001B05

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001B05
Size 48KB
SHA256 91a6f92b2b9003eb8b2d3b546ff6b3a64ed117fd085b3297c5cd196b0b18250d
MD5 52f6f4a63ade6402ce7b39ce66b208a1
SHA1 82d6d2cb40eded915619f45fd496cd91887adb3b
SHA512 26fb6a0e84f797170c696e878131119d8fe1931d7e7760bcd7322438187b836592cf2156eb01a063ebc0d6234eaad3d0d45b49349806adb661357eeea5f1973e
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8L:bLy2Kerc64CiGImav42j0D
TLSH
T191234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 af6460974735efa3795abe021610fda66545685a596635f6a07e75eeea85e06c
MD5 14a3735d4398e1a467223aa4ce072810
SHA1 c29bdba38f937004f6e9e21c79b74c9e44b93321
SHA512 399204b969224cb88c1da8380171b43bbbb6f3cad4fee569c66b8cb69fe0cbe7691065bf6e3255be61dc4b2ed2b6b4f36fc2a18c7ebd9e9815bdc3aa3ed18374
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v89:bLy2Kerc64CiGImav42j0l
TLSH
T184234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1876-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1876-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3836-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5532-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5532-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads