juko | 97cfc40424e7894923d1968b72898315955a0082495df6fd9e9ed2b5db0f79ff

General

Target
2026-08-31_612a8309f7b53b0ce46ce73b2eef9623_elex_wannacry.exe
Size 88KB
Sample260831-ybtbjsep21
SHA256 97cfc40424e7894923d1968b72898315955a0082495df6fd9e9ed2b5db0f79ff
MD5 612a8309f7b53b0ce46ce73b2eef9623
SHA1 f915db5602c82fcf8a4fe4af2b775f1e59e9cb26
SHA512 e23600a42aba35a795406754a21a8a2f0256a040bbab2603c1f0595515bcc19a79e490baf68e0465496939b44d483b0b5963cba594ea672b54e49c2dd7bd0415
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsI:zLy2Kerc64CiGImHc/28wzCBlycJWeer
TLSH
T1D1933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/4488-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000c000000019cb8-5.dat	family_juko
behavioral2/memory/4488-9-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/2884-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c533-13.dat	family_juko
behavioral2/memory/4900-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/4900-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2884	WINWORD.exe
4900	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-1-5-21-3797332335-34111092-3597280141-1000\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
3856	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	2026-08-31_612a8309f7b53b0ce46ce73b2eef9623_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
3856	cmd.exe
3056	PING.EXE
1332	PING.EXE
4544	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3056	PING.EXE
1332	PING.EXE
4544	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4488 wrote to memory of 2884	4488	2026-08-31_612a8309f7b53b0ce46ce73b2eef9623_elex_wannacry.exe	88
PID 2884 wrote to memory of 3856	2884	WINWORD.exe	89
PID 3856 wrote to memory of 3056	3856	cmd.exe	91
PID 3856 wrote to memory of 1332	3856	cmd.exe	92
PID 3856 wrote to memory of 4544	3856	cmd.exe	93
PID 3856 wrote to memory of 4900	3856	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-31_612a8309f7b53b0ce46ce73b2eef9623_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_612a8309f7b53b0ce46ce73b2eef9623_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4488
- 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:2884
- - 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\00005A16" 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:3856
  - - 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:3056
  - - 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:1332
  - - 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:4544
  - - 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:4900

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

00005A16

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005A16
Size 88KB
SHA256 0a149cd3203181d9e7752c1a835ef33910c543e585729241b0a320283beb17e2
MD5 9bee0764e4b07febe6c6f22a9d4e0349
SHA1 62f1b23c3546a27287f9cbe34e196e74eb9f3bda
SHA512 e998bc3fe9c4bab837a09a4851ddfac99995813ff1d9dd829677de98576f168ba6ea3c3920ac3679ccda15b141dfe1e2dbb22bee5db946874fdd4edaeab84e89
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsf:zLy2Kerc64CiGImHc/28wzCBlycJWeeo
TLSH
T146933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 97cfc40424e7894923d1968b72898315955a0082495df6fd9e9ed2b5db0f79ff
MD5 612a8309f7b53b0ce46ce73b2eef9623
SHA1 f915db5602c82fcf8a4fe4af2b775f1e59e9cb26
SHA512 e23600a42aba35a795406754a21a8a2f0256a040bbab2603c1f0595515bcc19a79e490baf68e0465496939b44d483b0b5963cba594ea672b54e49c2dd7bd0415
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsI:zLy2Kerc64CiGImHc/28wzCBlycJWeer
TLSH
T1D1933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2884-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4488-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4488-9-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4900-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4900-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads