juko | d46fbe79ccba0e61709469647d92a21433cec6ef7fd9de7ff9fe4bceabbb5aa9

General

Target
2026-09-04_7d1b13c50b93a4a03be32cc5496fb66c_elex_wannacry.exe
Size 69KB
Sample260905-gf77tsvsbx
SHA256 d46fbe79ccba0e61709469647d92a21433cec6ef7fd9de7ff9fe4bceabbb5aa9
MD5 7d1b13c50b93a4a03be32cc5496fb66c
SHA1 157e1ce09fe8a9d848ac65d67a6260f300eb6cd1
SHA512 100c55cc0a27d6ee583fa6e941e84fad099d5c438ba4ed857ec3905787d562aa38215edd0e2691964d63e414d8a883c3dafcdb29c8ddad63a67678de7ee6448b
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM9a:tLy2Kerc64CiGIm1K851YOhqYBwEM9a
TLSH
T1B363070737A4A1E1D0A35270E8660B649B37ECB19A73A2077B94771D1DB2A41CF31B9B
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/0x000700000001b714-4.dat	family_juko
behavioral2/files/0x000e00000001c405-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5376	WINWORD.exe
3340	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
4536	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-04_7d1b13c50b93a4a03be32cc5496fb66c_elex_wannacry.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
4536	cmd.exe
4624	PING.EXE
3360	PING.EXE
4520	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4624	PING.EXE
3360	PING.EXE
4520	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4076 wrote to memory of 5376	4076	2026-09-04_7d1b13c50b93a4a03be32cc5496fb66c_elex_wannacry.exe	89
PID 5376 wrote to memory of 4536	5376	WINWORD.exe	90
PID 4536 wrote to memory of 4624	4536	cmd.exe	92
PID 4536 wrote to memory of 3360	4536	cmd.exe	93
PID 4536 wrote to memory of 4520	4536	cmd.exe	94
PID 4536 wrote to memory of 3340	4536	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-04_7d1b13c50b93a4a03be32cc5496fb66c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-04_7d1b13c50b93a4a03be32cc5496fb66c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4076
- 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:5376
- - 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\0000534F" 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:4536
  - - 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:4624
  - - 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:3360
  - - 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:4520
  - - 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:3340

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

0000534F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000534F
Size 69KB
SHA256 d3174d84923772d4e02ff61624a46fc56a5fdc017ebaa02b755bdabce9257b3b
MD5 a9bd9b13f2c0a9da5dc4a2b402f58d19
SHA1 b2bff09d781ab1a0479799c8426be1afe7435207
SHA512 ef37b446466c6e7e3e3c6094aaa5a1d73f0958d162408d5511f592a88d00b6ba9982b0463d71f6874b603c56d32eaf31471b412d28d285154923cfaccefa9769
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM9R:tLy2Kerc64CiGIm1K851YOhqYBwEM9R
TLSH
T12F63F70737A4A1E1D0A35270E8660B649B37ECB19A73A2077B94771D1DB2A41CF31B9B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 69KB
SHA256 d46fbe79ccba0e61709469647d92a21433cec6ef7fd9de7ff9fe4bceabbb5aa9
MD5 7d1b13c50b93a4a03be32cc5496fb66c
SHA1 157e1ce09fe8a9d848ac65d67a6260f300eb6cd1
SHA512 100c55cc0a27d6ee583fa6e941e84fad099d5c438ba4ed857ec3905787d562aa38215edd0e2691964d63e414d8a883c3dafcdb29c8ddad63a67678de7ee6448b
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM9a:tLy2Kerc64CiGIm1K851YOhqYBwEM9a
TLSH
T1B363070737A4A1E1D0A35270E8660B649B37ECB19A73A2077B94771D1DB2A41CF31B9B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads