juko | ea8cfba88af7080ef330c86cc2b7a2c6c7ea2f60ec5508e186c5ddf4217b96c2

General

Target
2026-08-19_1a65eb1dbd32ac79d149b54a7790e896_elex_wannacry.exe
Size 94KB
Sample260820-ax7jasaf45
SHA256 ea8cfba88af7080ef330c86cc2b7a2c6c7ea2f60ec5508e186c5ddf4217b96c2
MD5 1a65eb1dbd32ac79d149b54a7790e896
SHA1 e361fb29837816caed04e3437aa9630fc3c42195
SHA512 2747969f297fd2e61dfcbf8bd48eccf3abc99369db8317e98929ac11693f26b766782c2eef3ee3889f43621a806314e242d785968332020eadd6b4e99d25a3f7
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NX:RLy2Kerc64CiGImFYgUBWTb4/NX
TLSH
T1AD937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/2668-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c4ec-5.dat	family_juko
behavioral2/memory/2668-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5272-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c4f0-13.dat	family_juko
behavioral2/memory/5756-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5756-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5272	WINWORD.exe
5756	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
2632	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	2026-08-19_1a65eb1dbd32ac79d149b54a7790e896_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
5488	PING.EXE
5736	PING.EXE
2264	PING.EXE
2632	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5488	PING.EXE
5736	PING.EXE
2264	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2668 wrote to memory of 5272	2668	2026-08-19_1a65eb1dbd32ac79d149b54a7790e896_elex_wannacry.exe	89
PID 5272 wrote to memory of 2632	5272	WINWORD.exe	90
PID 2632 wrote to memory of 5488	2632	cmd.exe	92
PID 2632 wrote to memory of 5736	2632	cmd.exe	93
PID 2632 wrote to memory of 2264	2632	cmd.exe	94
PID 2632 wrote to memory of 5756	2632	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-19_1a65eb1dbd32ac79d149b54a7790e896_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-19_1a65eb1dbd32ac79d149b54a7790e896_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2668
- 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:5272
- - 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\00001DE6" 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:2632
  - - 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:5488
  - - 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:5736
  - - 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:2264
  - - 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:5756

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

00001DE6

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001DE6
Size 94KB
SHA256 7b36b9325d850284232d5d570d8770ab74eeaab64747d2fe5595f3a91d24b7e7
MD5 bc5edfc2abc3fdb0ddf552b0a055c074
SHA1 c10c7094b5450751949614fbc391c1d23ad24a3f
SHA512 888c6fde748d025892edc0ea8ede1d748af4398b5eee2eb3e1e63cfdf43fe94252a0b372fc03c54c3c0308fc15db86738d860da9ffa002e21329849eb1563fff
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NQ:RLy2Kerc64CiGImFYgUBWTb4/NQ
TLSH
T1B5937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 ea8cfba88af7080ef330c86cc2b7a2c6c7ea2f60ec5508e186c5ddf4217b96c2
MD5 1a65eb1dbd32ac79d149b54a7790e896
SHA1 e361fb29837816caed04e3437aa9630fc3c42195
SHA512 2747969f297fd2e61dfcbf8bd48eccf3abc99369db8317e98929ac11693f26b766782c2eef3ee3889f43621a806314e242d785968332020eadd6b4e99d25a3f7
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NX:RLy2Kerc64CiGImFYgUBWTb4/NX
TLSH
T1AD937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2668-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2668-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5272-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5756-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5756-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads