juko | 08b0e7423ece701d9c50fb1f5c2e665ea94d6a09a37c385cef4bab4818a77989

General

Target
2026-07-15_07de753c8754cf7e9c36cc910fdf3c51_elex_wannacry.exe
Size 49KB
Sample260715-prdflacv6r
SHA256 08b0e7423ece701d9c50fb1f5c2e665ea94d6a09a37c385cef4bab4818a77989
MD5 07de753c8754cf7e9c36cc910fdf3c51
SHA1 f7abe61870a59887a428629068e35ac0b5303679
SHA512 a4478f549b6801df2a340761ea37078a230a7e6867b9187674f783288a89fe62eccd62761862c3e66bcb0f6214c362894074eefd05f7870af2dcb713814bb32a
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2i:VLy2Kerc64CiGImVucp4kojWh2i
TLSH
T130334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
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/4724-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b00000001136f-5.dat	family_juko
behavioral2/memory/4724-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/6116-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001700000001c5ca-13.dat	family_juko
behavioral2/memory/5864-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5864-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
6116	WINWORD.exe
5864	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-1-5-21-3986082593-3624157295-3514260330-1000\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	2026-07-15_07de753c8754cf7e9c36cc910fdf3c51_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
6012	cmd.exe
4408	PING.EXE
4328	PING.EXE
2228	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2228	PING.EXE
4408	PING.EXE
4328	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4724 wrote to memory of 6116	4724	2026-07-15_07de753c8754cf7e9c36cc910fdf3c51_elex_wannacry.exe	86
PID 6116 wrote to memory of 6012	6116	WINWORD.exe	87
PID 6012 wrote to memory of 4408	6012	cmd.exe	89
PID 6012 wrote to memory of 4328	6012	cmd.exe	90
PID 6012 wrote to memory of 2228	6012	cmd.exe	91
PID 6012 wrote to memory of 5864	6012	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-07-15_07de753c8754cf7e9c36cc910fdf3c51_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-15_07de753c8754cf7e9c36cc910fdf3c51_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4724
- 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:6116
- - 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\00007069" 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:6012
  - - 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:4408
  - - 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:4328
  - - 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:2228
  - - 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:5864

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

00007069

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007069
Size 49KB
SHA256 3f3a77355b9c91dfa986bb777dfdd828eadabfdf70719f282ca225d2bebe32e7
MD5 0fa63319ae790eed6952865c4d7e917c
SHA1 1cc993648618f159d93ec7666941301e5caf84f8
SHA512 b61f0499a6c53deb2631d21057d82c5b69666720a0363200131b8499cd82b80b56e698ed8cd7fda4d66652e2e70983839cfa3357545ecdaa57c02cc8345730bb
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2g:VLy2Kerc64CiGImVucp4kojWh2g
TLSH
T1F3334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 08b0e7423ece701d9c50fb1f5c2e665ea94d6a09a37c385cef4bab4818a77989
MD5 07de753c8754cf7e9c36cc910fdf3c51
SHA1 f7abe61870a59887a428629068e35ac0b5303679
SHA512 a4478f549b6801df2a340761ea37078a230a7e6867b9187674f783288a89fe62eccd62761862c3e66bcb0f6214c362894074eefd05f7870af2dcb713814bb32a
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2i:VLy2Kerc64CiGImVucp4kojWh2i
TLSH
T130334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4724-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4724-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5864-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5864-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6116-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads