juko | 8963da01bcd999eb2a19fd37a37e0039d63fc8451fa5161ecdb2f91778f5aec5

General

Target
2026-08-23_c0ee972006fcf4a470db33eba58a7aae_elex_wannacry.exe
Size 88KB
Sample260823-2evwbsbk7x
SHA256 8963da01bcd999eb2a19fd37a37e0039d63fc8451fa5161ecdb2f91778f5aec5
MD5 c0ee972006fcf4a470db33eba58a7aae
SHA1 191a9d5ae1ab9599cadbcba63776cc8a3ef39be7
SHA512 943cde004261dc4b155731e00db85b15a5fe7a6625c760432c312952c5f471d9f6f15a006ba618a941ad791da3e85858646d21cc9f0197de5eef54de599cad81
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsY:zLy2Kerc64CiGImHc/28wzCBlycJWeej
TLSH
T177933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/5056-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001400000001c4ec-5.dat	family_juko
behavioral2/memory/5056-10-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/4936-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5d8-13.dat	family_juko
behavioral2/memory/5588-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/5588-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4936	WINWORD.exe
5588	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-1-5-21-2246396966-3025826688-3847171515-1000\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
1440	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	2026-08-23_c0ee972006fcf4a470db33eba58a7aae_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
1440	cmd.exe
240	PING.EXE
5076	PING.EXE
1068	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
240	PING.EXE
5076	PING.EXE
1068	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5056 wrote to memory of 4936	5056	2026-08-23_c0ee972006fcf4a470db33eba58a7aae_elex_wannacry.exe	89
PID 4936 wrote to memory of 1440	4936	WINWORD.exe	90
PID 1440 wrote to memory of 240	1440	cmd.exe	92
PID 1440 wrote to memory of 5076	1440	cmd.exe	93
PID 1440 wrote to memory of 1068	1440	cmd.exe	94
PID 1440 wrote to memory of 5588	1440	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-23_c0ee972006fcf4a470db33eba58a7aae_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-23_c0ee972006fcf4a470db33eba58a7aae_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5056
- 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:4936
- - 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\000061B5" 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:1440
  - - 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:240
  - - 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:5076
  - - 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:1068
  - - 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:5588

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:3944

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

Replay Monitor

Loading Replay Monitor...

Downloads

000061B5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000061B5
Size 88KB
SHA256 56bcbf794443d58c3508784fe401be0fd4472335ffc9e74201761003b6006fae
MD5 0d5025761d1d73d92f9278684a2a51ed
SHA1 6598430992981876c345c5e115445b5a966845e3
SHA512 132a43200871484adec26d0f1dd056f4c1d9dea0aeacb88494bd18b8c583306e490280f1051f79df4debc7d7fe852781a0bafc5436f57ef6266731a3db0da628
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs1:zLy2Kerc64CiGImHc/28wzCBlycJWeeu
TLSH
T1A1933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 8963da01bcd999eb2a19fd37a37e0039d63fc8451fa5161ecdb2f91778f5aec5
MD5 c0ee972006fcf4a470db33eba58a7aae
SHA1 191a9d5ae1ab9599cadbcba63776cc8a3ef39be7
SHA512 943cde004261dc4b155731e00db85b15a5fe7a6625c760432c312952c5f471d9f6f15a006ba618a941ad791da3e85858646d21cc9f0197de5eef54de599cad81
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsY:zLy2Kerc64CiGImHc/28wzCBlycJWeej
TLSH
T177933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4936-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5056-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5056-10-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5588-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5588-17-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads