juko | 23955e817db0b01f6e33a0f81099be0b1efe5f0e93601df1448df873dfb40bc7

General

Target
2026-08-01_ffffa322a7089a81f4b4e8665f74684d_elex_wannacry.exe
Size 48KB
Sample260802-eccweateph
SHA256 23955e817db0b01f6e33a0f81099be0b1efe5f0e93601df1448df873dfb40bc7
MD5 ffffa322a7089a81f4b4e8665f74684d
SHA1 a7ffc2d30263d8479744a8644430d2ece95834f6
SHA512 1dd6e4e43f087247e8690eb96c743d98b5a2673c540637886aadf0881d9509174e9526f090dcaa12cdeae0385e2840a51c82d1d57d45f840653df3224e61630b
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8k:bLy2Kerc64CiGImav42j08
TLSH
T1C4234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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
behavioral1/memory/3676-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b0000000243ff-5.dat	family_juko
behavioral1/memory/3676-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4224-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000a000000024400-15.dat	family_juko
behavioral1/memory/3764-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3764-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	2026-08-01_ffffa322a7089a81f4b4e8665f74684d_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4224	WINWORD.exe
3764	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-1-5-21-876885714-46325919-1482798410-1000\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
1952	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_ffffa322a7089a81f4b4e8665f74684d_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
4440	PING.EXE
1952	cmd.exe
5068	PING.EXE
4188	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5068	PING.EXE
4188	PING.EXE
4440	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3676 wrote to memory of 4224	3676	2026-08-01_ffffa322a7089a81f4b4e8665f74684d_elex_wannacry.exe	85
PID 4224 wrote to memory of 1952	4224	WINWORD.exe	86
PID 1952 wrote to memory of 5068	1952	cmd.exe	88
PID 1952 wrote to memory of 4188	1952	cmd.exe	89
PID 1952 wrote to memory of 4440	1952	cmd.exe	90
PID 1952 wrote to memory of 3764	1952	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_ffffa322a7089a81f4b4e8665f74684d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_ffffa322a7089a81f4b4e8665f74684d_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3676
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4224
- - 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\0000636A" 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:1952
  - - 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:5068
  - - 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:4188
  - - 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:4440
  - - 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:3764

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

0000636A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000636A
Size 48KB
SHA256 7098eecbd263295c352bd1350aa334632cdec9862f90703306dbdec2a5382e94
MD5 528a3423e4c35bb19ca45fa348521436
SHA1 2421139ed3ad4dda79c6a9a48e910f677ca45146
SHA512 a939a820f27b7ed2b9db7998db1b30f851eefaeddc3066cfa81a3886ae8522aacd3250d98f9b61f3e5a433ae6a61432e1cb9ebd512f728073178138f6d8d6b5d
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8w:bLy2Kerc64CiGImav42j04
TLSH
T13F234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 23955e817db0b01f6e33a0f81099be0b1efe5f0e93601df1448df873dfb40bc7
MD5 ffffa322a7089a81f4b4e8665f74684d
SHA1 a7ffc2d30263d8479744a8644430d2ece95834f6
SHA512 1dd6e4e43f087247e8690eb96c743d98b5a2673c540637886aadf0881d9509174e9526f090dcaa12cdeae0385e2840a51c82d1d57d45f840653df3224e61630b
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8k:bLy2Kerc64CiGImav42j08
TLSH
T1C4234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3676-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3676-11-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3764-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3764-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4224-14-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads