juko | 71f2169c396998722158f62773e8d5807aaf1581065a5714912825bdb4c3f3ad

General

Target
2026-07-01_82b94df37aa6489b514b80c1e4a4a33c_elex_wannacry.exe
Size 56KB
Sample260701-k68stsat4p
SHA256 71f2169c396998722158f62773e8d5807aaf1581065a5714912825bdb4c3f3ad
MD5 82b94df37aa6489b514b80c1e4a4a33c
SHA1 68c30c8991c4dd684447e7535761828ac79bd8ff
SHA512 58b7a71d405a6ba81f1853d871a2330520317a70051071bf3e671a1f3ee829b15fdb944b74052cf145f122ab995df42725b373af1711c321eef70863fa2a8974
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWy:PLy2Kerc64CiGImqRa8OKFE9WBy
TLSH
T1E64319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
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/3496-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c556-5.dat	family_juko
behavioral2/memory/3496-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4816-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c557-13.dat	family_juko
behavioral2/memory/4164-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4164-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4816	WINWORD.exe
4164	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-1-5-21-2639994890-966400312-4246138405-1000\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	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_82b94df37aa6489b514b80c1e4a4a33c_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
4240	PING.EXE
2236	cmd.exe
1152	PING.EXE
1888	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1152	PING.EXE
1888	PING.EXE
4240	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3496 wrote to memory of 4816	3496	2026-07-01_82b94df37aa6489b514b80c1e4a4a33c_elex_wannacry.exe	88
PID 4816 wrote to memory of 2236	4816	WINWORD.exe	89
PID 2236 wrote to memory of 1152	2236	cmd.exe	91
PID 2236 wrote to memory of 1888	2236	cmd.exe	92
PID 2236 wrote to memory of 4240	2236	cmd.exe	93
PID 2236 wrote to memory of 4164	2236	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-01_82b94df37aa6489b514b80c1e4a4a33c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-01_82b94df37aa6489b514b80c1e4a4a33c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3496
- 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:4816
- - 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\00005D20" 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:2236
  - - 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:1152
  - - 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:1888
  - - 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:4240
  - - 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:4164

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

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Downloads

00005D20

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005D20
Size 56KB
SHA256 f519b0915d393ace8d7837451b3588a1ae3e9d7b4410e896b6bdb4c27831aa95
MD5 b79c40984e30ac9b0ef8b468a41cbbf0
SHA1 230184178e016969649b235105e4966fa529719b
SHA512 efdf08e118c2f2fa13e71c9b9472d6ba791a59d90c2c7a0b0d5a41be8eebdb9f44543ec1714426f44db13549c44e7b2eee10c58a968e96a2b04adbebc5e1c3a5
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWj:PLy2Kerc64CiGImqRa8OKFE9WBj
TLSH
T1784319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 71f2169c396998722158f62773e8d5807aaf1581065a5714912825bdb4c3f3ad
MD5 82b94df37aa6489b514b80c1e4a4a33c
SHA1 68c30c8991c4dd684447e7535761828ac79bd8ff
SHA512 58b7a71d405a6ba81f1853d871a2330520317a70051071bf3e671a1f3ee829b15fdb944b74052cf145f122ab995df42725b373af1711c321eef70863fa2a8974
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWy:PLy2Kerc64CiGImqRa8OKFE9WBy
TLSH
T1E64319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3496-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3496-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4164-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4164-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4816-12-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads