juko | 43d01f4f16583b95ecaad7b96ffaa3bea41b076955f883fba8278c3fc896cbae

General

Target
2026-04-17_66555e28d0773f23cc5cca827b1e8d2c_elex_wannacry.exe
Size 37KB
Sample260417-vehsfady5m
SHA256 43d01f4f16583b95ecaad7b96ffaa3bea41b076955f883fba8278c3fc896cbae
MD5 66555e28d0773f23cc5cca827b1e8d2c
SHA1 b73c07462ede31d942048c21249066ecb842137c
SHA512 78e9d373360aa8a116a84a3e61ef11c9de8503cb4bab2a171f33ccc7d55e2a184cac0be1fedaee61c798af4b6506c6dfcf2310975b8f7c21875a6a01547d8c8f
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa2:3LsF2Kerc64sTiX2IV0DhuogwF
TLSH
T11E035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/5052-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x002800000002b11c-5.dat	family_juko
behavioral2/memory/5052-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4900-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001d00000002b251-15.dat	family_juko
behavioral2/memory/1948-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1948-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4900	WINWORD.exe
1948	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-1-5-21-1383858298-2057492509-1726743289-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-17_66555e28d0773f23cc5cca827b1e8d2c_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
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
3164	cmd.exe
1076	PING.EXE
2248	PING.EXE
2684	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1076	PING.EXE
2248	PING.EXE
2684	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5052 wrote to memory of 4900	5052	2026-04-17_66555e28d0773f23cc5cca827b1e8d2c_elex_wannacry.exe	81
PID 4900 wrote to memory of 3164	4900	WINWORD.exe	82
PID 3164 wrote to memory of 1076	3164	cmd.exe	84
PID 3164 wrote to memory of 2248	3164	cmd.exe	85
PID 3164 wrote to memory of 2684	3164	cmd.exe	86
PID 3164 wrote to memory of 1948	3164	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-04-17_66555e28d0773f23cc5cca827b1e8d2c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-17_66555e28d0773f23cc5cca827b1e8d2c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5052
- 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:4900
- - 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\00004391" 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:3164
  - - 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:1076
  - - 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:2248
  - - 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:2684
  - - 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:1948

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

00004391

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004391
Size 37KB
SHA256 20cef7f1173857b0cc8dcde5f688b263ce661d4e9f9f3f8f5b44adf0028d5ce6
MD5 b6fbea8272857d7714b265b3fc8ca7fd
SHA1 a0aea9224757f1369589d0a48cfa442188f134af
SHA512 822289b5b076e9e8d4a020dbcaf46fdbcf8a3e8f9034d997efb06a0f9dc5b4da624e6971d5f4dc33ec3b27671f2092e7c7070c06df7535316dff1dfbcb9ba5cf
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa4:3LsF2Kerc64sTiX2IV0Dhuogwf
TLSH
T190035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 43d01f4f16583b95ecaad7b96ffaa3bea41b076955f883fba8278c3fc896cbae
MD5 66555e28d0773f23cc5cca827b1e8d2c
SHA1 b73c07462ede31d942048c21249066ecb842137c
SHA512 78e9d373360aa8a116a84a3e61ef11c9de8503cb4bab2a171f33ccc7d55e2a184cac0be1fedaee61c798af4b6506c6dfcf2310975b8f7c21875a6a01547d8c8f
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa2:3LsF2Kerc64sTiX2IV0DhuogwF
TLSH
T11E035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1948-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1948-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4900-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5052-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5052-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads