juko | c296b7d928c571fdf7997b04bb7e2d4b93cbd4fcef748ed1f54dcc1bbdf5dd8c

General

Target
2026-04-15_db66d53df2f61d2f7d66224034164214_elex_wannacry.exe
Size 67KB
Sample260415-nvzmkafy4t
SHA256 c296b7d928c571fdf7997b04bb7e2d4b93cbd4fcef748ed1f54dcc1bbdf5dd8c
MD5 db66d53df2f61d2f7d66224034164214
SHA1 5fbbde09a3e9ffbf12fbcbb790b0f6d106433a58
SHA512 beaff987995eb710337775a45270c7a57cdf8c2f502ce13b3d5f43fc9c545e1bba2025447c679f3af42c7a887a0c837d00faf86a59fd6e32f71ca9d5db1702b3
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQ5:aLy2Kerc64CiGImRylFyp8T+
TLSH
T195633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
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 6 IoCs

resource	yara_rule
behavioral2/memory/4340-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001e00000002b0f5-5.dat	family_juko
behavioral2/memory/4340-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2128-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b32b-15.dat	family_juko
behavioral2/memory/4080-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2128	WINWORD.exe
4080	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-1-5-21-3847269522-1618051987-1942096715-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-15_db66d53df2f61d2f7d66224034164214_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
1836	cmd.exe
1224	PING.EXE
5084	PING.EXE
2284	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1224	PING.EXE
5084	PING.EXE
2284	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4340 wrote to memory of 2128	4340	2026-04-15_db66d53df2f61d2f7d66224034164214_elex_wannacry.exe	80
PID 2128 wrote to memory of 1836	2128	WINWORD.exe	81
PID 1836 wrote to memory of 1224	1836	cmd.exe	83
PID 1836 wrote to memory of 5084	1836	cmd.exe	84
PID 1836 wrote to memory of 2284	1836	cmd.exe	85
PID 1836 wrote to memory of 4080	1836	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-15_db66d53df2f61d2f7d66224034164214_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_db66d53df2f61d2f7d66224034164214_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4340
- 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:2128
- - 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\00001F20" 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:1836
  - - 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:1224
  - - 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:5084
  - - 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:2284
  - - 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:4080

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

00001F20

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001F20
Size 67KB
SHA256 0c51ae3b906639151033108460c1546b6b58054e3ced9e341311b0e3b4d5d4e7
MD5 8390a8f993e7f0c81c78dcaf612cae98
SHA1 154241d0296966ecdd36d355ce0a81fdffef80b7
SHA512 aa27c6be842b1832bb9fc2bbd3052940ed3adb8477c7710a9fa67f6d5886e5c9656c669318feff658d60752d227bf48d1ba4dee8d27d30553ba54e6217dc0767
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQG:aLy2Kerc64CiGImRylFyp8Th
TLSH
T1AC633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 67KB
SHA256 c296b7d928c571fdf7997b04bb7e2d4b93cbd4fcef748ed1f54dcc1bbdf5dd8c
MD5 db66d53df2f61d2f7d66224034164214
SHA1 5fbbde09a3e9ffbf12fbcbb790b0f6d106433a58
SHA512 beaff987995eb710337775a45270c7a57cdf8c2f502ce13b3d5f43fc9c545e1bba2025447c679f3af42c7a887a0c837d00faf86a59fd6e32f71ca9d5db1702b3
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQ5:aLy2Kerc64CiGImRylFyp8T+
TLSH
T195633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2128-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4080-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4340-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4340-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads