juko | a9182946b7e3c6dab025eb33678379144d3daae3ac6f8cbfaef5a0a1c86b758f

General

Target
2026-08-04_99babe0cad50bbe0004c83e9eabff45a_elex_wannacry.exe
Size 69KB
Sample260804-xtfbzafe66
SHA256 a9182946b7e3c6dab025eb33678379144d3daae3ac6f8cbfaef5a0a1c86b758f
MD5 99babe0cad50bbe0004c83e9eabff45a
SHA1 6398eabe8aeea98bb69b29c758a2ef38e387625a
SHA512 1b9ed1ca492c3f430727e5aa0a9cc026d74875f61e668352430bf49d335a16eb9a8f787935f1ed0e51c4bbb771167f4c5c51a7704d8188bd90f4e398a0635a4d
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM9U:tLy2Kerc64CiGIm1K851YOhqYBwEM9U
TLSH
T19D63F70737A4A1E1D0A35270E8660B649B37ECB19A73A3077B94771D1DB2A41CF31B9B
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 2 IoCs

resource	yara_rule
behavioral2/files/0x00080000000113d4-4.dat	family_juko
behavioral2/files/0x000f00000001c569-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4072	WINWORD.exe
4880	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-1-5-21-2301830172-776172150-2531349243-1000\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
4120	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	2026-08-04_99babe0cad50bbe0004c83e9eabff45a_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
4120	cmd.exe
1200	PING.EXE
3608	PING.EXE
5200	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1200	PING.EXE
3608	PING.EXE
5200	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1212 wrote to memory of 4072	1212	2026-08-04_99babe0cad50bbe0004c83e9eabff45a_elex_wannacry.exe	89
PID 4072 wrote to memory of 4120	4072	WINWORD.exe	90
PID 4120 wrote to memory of 1200	4120	cmd.exe	92
PID 4120 wrote to memory of 3608	4120	cmd.exe	93
PID 4120 wrote to memory of 5200	4120	cmd.exe	94
PID 4120 wrote to memory of 4880	4120	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_99babe0cad50bbe0004c83e9eabff45a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_99babe0cad50bbe0004c83e9eabff45a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1212
- 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:4072
- - 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\00001A4D" 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:4120
  - - 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:1200
  - - 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:3608
  - - 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:5200
  - - 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:4880

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

00001A4D

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001A4D
Size 69KB
SHA256 45d6c9118f7403b955df032c735c7858337dbc89c46af3a02eef9d458a3970a7
MD5 2b670aaaf65795c562860b1671fa8382
SHA1 f93b8c7d8ed0618f9530525690b1992b27a50188
SHA512 b4ee7e3a4563d59103b00cf900132946e11e2a0c78291f38974b58eeb9c01ef78c900b026f1d9106880606b99aece65731d021d5472e0a008f2a3eaca13f0323
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM9w:tLy2Kerc64CiGIm1K851YOhqYBwEM9w
TLSH
T14C63F70737A4A1E1D0A35270E8660B649B37ECB19A73A2077B94771D1DB2A41CF31B9B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 69KB
SHA256 a9182946b7e3c6dab025eb33678379144d3daae3ac6f8cbfaef5a0a1c86b758f
MD5 99babe0cad50bbe0004c83e9eabff45a
SHA1 6398eabe8aeea98bb69b29c758a2ef38e387625a
SHA512 1b9ed1ca492c3f430727e5aa0a9cc026d74875f61e668352430bf49d335a16eb9a8f787935f1ed0e51c4bbb771167f4c5c51a7704d8188bd90f4e398a0635a4d
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM9U:tLy2Kerc64CiGIm1K851YOhqYBwEM9U
TLSH
T19D63F70737A4A1E1D0A35270E8660B649B37ECB19A73A3077B94771D1DB2A41CF31B9B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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