juko | a2da07822a181e101ab61cc3c9ebeb5d1a5a090a2987a1244e17575e7539078e

General

Target
2026-07-01_4051e81404dd09785a1f69c8e9f21db2_elex_wannacry.exe
Size 86KB
Sample260701-vr4wfaa12m
SHA256 a2da07822a181e101ab61cc3c9ebeb5d1a5a090a2987a1244e17575e7539078e
MD5 4051e81404dd09785a1f69c8e9f21db2
SHA1 f35c7f1376df94a57589d059a69d687b2df5db50
SHA512 db0594ede4be5b56fe904f77b98bf824508a62adfec49fffae74dc4610bb30023c70ecd77b72b7d90cfbb9ac53a9142d8f3d1cab18630840e87957ef3b3b1aa3
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpK:vLy2Kerc64CiGImMPu/ouEQkwpK
TLSH
T19683C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/4232-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000d000000019cb6-5.dat	family_juko
behavioral2/memory/4232-10-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1300-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001000000001c585-13.dat	family_juko
behavioral2/memory/5856-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5856-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1300	WINWORD.exe
5856	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-1-5-21-2132828192-1552876075-2324613956-1000\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

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	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	2026-07-01_4051e81404dd09785a1f69c8e9f21db2_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
2208	PING.EXE
3848	cmd.exe
2060	PING.EXE
2444	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2060	PING.EXE
2444	PING.EXE
2208	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4232 wrote to memory of 1300	4232	2026-07-01_4051e81404dd09785a1f69c8e9f21db2_elex_wannacry.exe	88
PID 1300 wrote to memory of 3848	1300	WINWORD.exe	89
PID 3848 wrote to memory of 2060	3848	cmd.exe	91
PID 3848 wrote to memory of 2444	3848	cmd.exe	92
PID 3848 wrote to memory of 2208	3848	cmd.exe	93
PID 3848 wrote to memory of 5856	3848	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-01_4051e81404dd09785a1f69c8e9f21db2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-01_4051e81404dd09785a1f69c8e9f21db2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4232
- 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:1300
- - 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\0000445C" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3848
  - - 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:2060
  - - 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:2444
  - - 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:2208
  - - 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:5856

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

0000445C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000445C
Size 86KB
SHA256 a7322cea1b8d7f0d28c59c3472f0946c18f87996bfda90ca29d8956d90a3f013
MD5 e7d57839f16686ca7639b6f68c5694e8
SHA1 d538555780f87d303073d33e5d3169bb284fc802
SHA512 2b86d6c51ba2de982dceb673d4d6afab3a9a22dfe1440603f6d0bcbefa51bd4634dd05f1483d3afff041e91b3ac46f961eac0da90c15d3a4f3e50085c79b24a1
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwp0:vLy2Kerc64CiGImMPu/ouEQkwp0
TLSH
T14183C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 86KB
SHA256 a2da07822a181e101ab61cc3c9ebeb5d1a5a090a2987a1244e17575e7539078e
MD5 4051e81404dd09785a1f69c8e9f21db2
SHA1 f35c7f1376df94a57589d059a69d687b2df5db50
SHA512 db0594ede4be5b56fe904f77b98bf824508a62adfec49fffae74dc4610bb30023c70ecd77b72b7d90cfbb9ac53a9142d8f3d1cab18630840e87957ef3b3b1aa3
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpK:vLy2Kerc64CiGImMPu/ouEQkwpK
TLSH
T19683C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1300-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4232-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4232-10-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5856-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5856-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads