juko | b617e112f57d67e59054e82328030b9f8f0c39296f3a5b508bdb67de5307a391

Analysis

max time kernel
149s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
16/04/2026, 02:51

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General

Target
2026-04-16_de717c00202d820921953207cd4a9f1e_elex_wannacry.exe
Size 87KB
Sample260416-dchk8aew4l
SHA256 b617e112f57d67e59054e82328030b9f8f0c39296f3a5b508bdb67de5307a391
MD5 de717c00202d820921953207cd4a9f1e
SHA1 f815d76564f9da274014888b5836ba84c287f9f2
SHA512 d2a1d2629b874f71ad0fe96af4e970853cf4f3e57776fd803be30ec22a2558ffa778b7ffed92fd77aa46a67b1e0c99b184b9ae2b08bd55ab8353ecfbd1f368cd
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpv:2Ly2Kerc64CiGIm1K851YO6EQkwpv
TLSH
T1B893A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/2472-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001f00000002b375-5.dat	family_juko
behavioral2/memory/2472-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/776-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b471-17.dat	family_juko
behavioral2/memory/3256-19-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3256-21-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
776	WINWORD.exe
3256	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-1-5-21-2122505878-652277452-2375749442-1000\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

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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-16_de717c00202d820921953207cd4a9f1e_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

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
3352	cmd.exe
1748	PING.EXE
2956	PING.EXE
596	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1748	PING.EXE
2956	PING.EXE
596	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2472 wrote to memory of 776	2472	2026-04-16_de717c00202d820921953207cd4a9f1e_elex_wannacry.exe	80
PID 776 wrote to memory of 3352	776	WINWORD.exe	81
PID 3352 wrote to memory of 1748	3352	cmd.exe	83
PID 3352 wrote to memory of 2956	3352	cmd.exe	84
PID 3352 wrote to memory of 596	3352	cmd.exe	85
PID 3352 wrote to memory of 3256	3352	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-16_de717c00202d820921953207cd4a9f1e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-16_de717c00202d820921953207cd4a9f1e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2472
- 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:776
- - 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\000042C3" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3352
  - - 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:\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:2956
  - - 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:596
  - - 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:3256

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000042C3

Path C:\Users\Admin\AppData\Roaming\Mozilla\000042C3
Size 87KB
SHA256 68a6071568228236ea6caa8b1e5de6da2a93bd90cdc7f87153fd427d44f9a17d
MD5 148b06218134737fe19558be15726807
SHA1 b2caedecb1bd15b7bbb6fde346f736da060bb088
SHA512 7b2a0f91b21733e8426a2c3455f9bd222b11e1bbb2ea18bc54a8f12ea991b2d2cad8215e244f46b106e32049aa537b56b9b7ac301d4628dff983e4215dd7d58a
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpX:2Ly2Kerc64CiGIm1K851YO6EQkwpX
TLSH
T1DC93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 b617e112f57d67e59054e82328030b9f8f0c39296f3a5b508bdb67de5307a391
MD5 de717c00202d820921953207cd4a9f1e
SHA1 f815d76564f9da274014888b5836ba84c287f9f2
SHA512 d2a1d2629b874f71ad0fe96af4e970853cf4f3e57776fd803be30ec22a2558ffa778b7ffed92fd77aa46a67b1e0c99b184b9ae2b08bd55ab8353ecfbd1f368cd
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpv:2Ly2Kerc64CiGIm1K851YO6EQkwpv
TLSH
T1B893A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/776-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/776-15-0x00000000009A0000-0x0000000000FA2000-memory.dmp

Download

memory/2472-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2472-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2472-11-0x0000000000890000-0x0000000000E92000-memory.dmp

Download

memory/3256-19-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3256-21-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3256-20-0x0000000000A30000-0x0000000001032000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads