juko | a78d0b5a71e8b5c1b2cfb81ecdf50dd8f3776de646dea0a3281f49b723532bbf

General

Target
2026-08-22_1b9c6ac9c262dd07f6376feb220bd5c5_elex_wannacry.exe
Size 57KB
Sample260823-nvcsss1ths
SHA256 a78d0b5a71e8b5c1b2cfb81ecdf50dd8f3776de646dea0a3281f49b723532bbf
MD5 1b9c6ac9c262dd07f6376feb220bd5c5
SHA1 05db6f4bc6d9ed3a38e2d76c89bd9dc906e49b45
SHA512 6adb1c4c515adb9fb62a8e6366791dae6e707bc135f1da9b643cc910606a0c9cf19a7e138c6d1f48785db3356533579a6cf0ae5695f585c43d235bcc43fe1902
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQm:qLy2Kerc64CiGImklNUyp8Tx
TLSH
T17F433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/2916-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000900000001b85a-5.dat	family_juko
behavioral2/memory/2916-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3112-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c575-13.dat	family_juko
behavioral2/memory/5544-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/5544-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3112	WINWORD.exe
5544	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-1-5-21-3611646547-550105268-947503007-1000\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
3140	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-22_1b9c6ac9c262dd07f6376feb220bd5c5_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

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
4576	PING.EXE
1948	PING.EXE
3356	PING.EXE
3140	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4576	PING.EXE
1948	PING.EXE
3356	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2916 wrote to memory of 3112	2916	2026-08-22_1b9c6ac9c262dd07f6376feb220bd5c5_elex_wannacry.exe	89
PID 3112 wrote to memory of 3140	3112	WINWORD.exe	90
PID 3140 wrote to memory of 4576	3140	cmd.exe	92
PID 3140 wrote to memory of 1948	3140	cmd.exe	93
PID 3140 wrote to memory of 3356	3140	cmd.exe	94
PID 3140 wrote to memory of 5544	3140	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-22_1b9c6ac9c262dd07f6376feb220bd5c5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-22_1b9c6ac9c262dd07f6376feb220bd5c5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2916
- 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:3112
- - 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\00002A56" 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:3140
  - - 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:4576
  - - 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:1948
  - - 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:3356
  - - 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:5544

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

00002A56

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002A56
Size 57KB
SHA256 2d4ec397092fe92ce17ec57d0d91830bc85542a24da40da19ef22feca1df15a8
MD5 ff514eb415390782e34bb1602e62f2cf
SHA1 e5ec1b5e522c62acb3e5eb7240cce10f8304a7dc
SHA512 f60d58ea3f38511c7ee4d90ebba91e955a0898fe4209c4083f5a9549fe665168b30799b541f4ebf149dfef21570405cc55f54d3d5569f2398fb52e7381c50da3
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQt:qLy2Kerc64CiGImklNUyp8Ty
TLSH
T114433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 a78d0b5a71e8b5c1b2cfb81ecdf50dd8f3776de646dea0a3281f49b723532bbf
MD5 1b9c6ac9c262dd07f6376feb220bd5c5
SHA1 05db6f4bc6d9ed3a38e2d76c89bd9dc906e49b45
SHA512 6adb1c4c515adb9fb62a8e6366791dae6e707bc135f1da9b643cc910606a0c9cf19a7e138c6d1f48785db3356533579a6cf0ae5695f585c43d235bcc43fe1902
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQm:qLy2Kerc64CiGImklNUyp8Tx
TLSH
T17F433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2916-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2916-10-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/3112-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5544-15-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/5544-16-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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