juko | 1bef30f97f232fe2e5c56b04ca0ea254ea91689e2e4407b23ae60d67969348cc

General

Target
2026-08-01_ed6247dacec896c42794d0c60dafb676_elex_wannacry.exe
Size 87KB
Sample260802-edm3rssxfv
SHA256 1bef30f97f232fe2e5c56b04ca0ea254ea91689e2e4407b23ae60d67969348cc
MD5 ed6247dacec896c42794d0c60dafb676
SHA1 80bd03fe697905c4ac44479e69acbd11456a8703
SHA512 2484351a3c8e047785d9f9d93bc23c03d9bdf668a2995956cd96fa6269b7956d9fd0a9dd2007787a192f5e52aedb8c7aea8416d7d395aa862265d92a53bfff46
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpZ:2Ly2Kerc64CiGIm1K851YO6EQkwpZ
TLSH
T15F93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/4948-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000800000001b7f6-5.dat	family_juko
behavioral2/memory/4948-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4332-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001a00000001c47a-13.dat	family_juko
behavioral2/memory/3288-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3288-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4332	WINWORD.exe
3288	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-1-5-21-2246396966-3025826688-3847171515-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
5264	cmd.exe

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	2026-08-01_ed6247dacec896c42794d0c60dafb676_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
2144	PING.EXE
5264	cmd.exe
2084	PING.EXE
6112	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2084	PING.EXE
6112	PING.EXE
2144	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4948 wrote to memory of 4332	4948	2026-08-01_ed6247dacec896c42794d0c60dafb676_elex_wannacry.exe	89
PID 4332 wrote to memory of 5264	4332	WINWORD.exe	90
PID 5264 wrote to memory of 2084	5264	cmd.exe	92
PID 5264 wrote to memory of 6112	5264	cmd.exe	93
PID 5264 wrote to memory of 2144	5264	cmd.exe	94
PID 5264 wrote to memory of 3288	5264	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_ed6247dacec896c42794d0c60dafb676_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_ed6247dacec896c42794d0c60dafb676_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4948
- 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:4332
- - 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\00004415" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5264
  - - 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:2084
  - - 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:6112
  - - 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:2144
  - - 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:3288

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

00004415

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004415
Size 87KB
SHA256 e1c317263c8e73e81c06a83273280e77764fbf645bb510194bcd3951f9def735
MD5 939b5baa925a89dafcda28ce61afe993
SHA1 2e60b28fe1e3a96e0d3b40f6e1bd1ce07a468d29
SHA512 1090ba001ecca02dfb5c35f7448a3d822ae851a61d244e8921b1ecb37b0ada54531fe09a03ef3608f438ea4c9586c3c6b16f3519d2b5e1e883893d57317cef9e
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpx:2Ly2Kerc64CiGIm1K851YO6EQkwpx
TLSH
T16793A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 1bef30f97f232fe2e5c56b04ca0ea254ea91689e2e4407b23ae60d67969348cc
MD5 ed6247dacec896c42794d0c60dafb676
SHA1 80bd03fe697905c4ac44479e69acbd11456a8703
SHA512 2484351a3c8e047785d9f9d93bc23c03d9bdf668a2995956cd96fa6269b7956d9fd0a9dd2007787a192f5e52aedb8c7aea8416d7d395aa862265d92a53bfff46
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpZ:2Ly2Kerc64CiGIm1K851YO6EQkwpZ
TLSH
T15F93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3288-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3288-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4332-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4948-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4948-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads