juko | 3cf988408150d92e7481b17c7d0d9b1e8c43151659675f4af6b98d871e9a9174

General

Target
2026-07-15_b2c280c2cb3cb5a3e82962dd988583d3_elex_wannacry.exe
Size 49KB
Sample260715-cm66wsct81
SHA256 3cf988408150d92e7481b17c7d0d9b1e8c43151659675f4af6b98d871e9a9174
MD5 b2c280c2cb3cb5a3e82962dd988583d3
SHA1 ac1fe1dc52f15b77a5b450c1b7bf57ed46ba4f19
SHA512 36e5f99d07b2aab4af08bd4b3e2501cf4c181cc91aebab3cf8af4b7169cb2508d4e1616750e55487e4046fb387a8099409a5c8f5fe802adf4adbbd2b490c2ed2
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h22:VLy2Kerc64CiGImVucp4kojWh22
TLSH
T17E334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/4224-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b00000001b315-5.dat	family_juko
behavioral2/memory/4224-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5124-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c4f0-13.dat	family_juko
behavioral2/memory/3644-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3644-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5124	WINWORD.exe
3644	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-1-5-21-1875162379-3804078649-638427191-1000\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	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_b2c280c2cb3cb5a3e82962dd988583d3_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

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
4632	cmd.exe
5084	PING.EXE
5000	PING.EXE
5732	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5732	PING.EXE
5084	PING.EXE
5000	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4224 wrote to memory of 5124	4224	2026-07-15_b2c280c2cb3cb5a3e82962dd988583d3_elex_wannacry.exe	88
PID 5124 wrote to memory of 4632	5124	WINWORD.exe	89
PID 4632 wrote to memory of 5084	4632	cmd.exe	91
PID 4632 wrote to memory of 5000	4632	cmd.exe	92
PID 4632 wrote to memory of 5732	4632	cmd.exe	93
PID 4632 wrote to memory of 3644	4632	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-15_b2c280c2cb3cb5a3e82962dd988583d3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-15_b2c280c2cb3cb5a3e82962dd988583d3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4224
- 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:5124
- - 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\000004F2" 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:4632
  - - 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:5000
  - - 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:5732
  - - 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:3644

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

000004F2

Path C:\Users\Admin\AppData\Roaming\Mozilla\000004F2
Size 49KB
SHA256 f03b77391f757c983fc5ca54b7b6e2dbc6971da111b17050aa95e17764ac9c13
MD5 beb42b8e41eeceda0a42011076bd1b9f
SHA1 13baa649b033858a2ca87e76329603882c8dafc1
SHA512 8b8ea8fcae03b359b65a0e27ff49203c66c49ff78a7e4a2cc110d35a3e5f3d797fbd29b059aca65cb698fc2570c1f88bf4cc6b0cdbdb55556c58c1d948fb68c7
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2c:VLy2Kerc64CiGImVucp4kojWh2c
TLSH
T1BF334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 3cf988408150d92e7481b17c7d0d9b1e8c43151659675f4af6b98d871e9a9174
MD5 b2c280c2cb3cb5a3e82962dd988583d3
SHA1 ac1fe1dc52f15b77a5b450c1b7bf57ed46ba4f19
SHA512 36e5f99d07b2aab4af08bd4b3e2501cf4c181cc91aebab3cf8af4b7169cb2508d4e1616750e55487e4046fb387a8099409a5c8f5fe802adf4adbbd2b490c2ed2
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h22:VLy2Kerc64CiGImVucp4kojWh22
TLSH
T17E334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3644-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3644-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4224-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4224-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5124-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads