juko | 558e4d251564055ac71a998e18f17fc519ef15230b4f071dfedea6722be0113d

General

Target
2026-07-20_0045f7665ccbdf041f2e0cb5e8b93644_elex_wannacry.exe
Size 64KB
Sample260720-d78e5agz3s
SHA256 558e4d251564055ac71a998e18f17fc519ef15230b4f071dfedea6722be0113d
MD5 0045f7665ccbdf041f2e0cb5e8b93644
SHA1 c5b7fd2a8622499b90f12643a7b1ff2764777cfa
SHA512 a24413dab28400fb3eddff8f19f17e3ba79f757eb566c4a7349b406fa9d0901c82132e221b562a24b4744088cdf119e8d46050fbb066838c5a5f00e7adc08ad5
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uW:sLy2Kerc64CiGIm8so28W
TLSH
T19B535C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x0009000000019cb5-4.dat	family_juko
behavioral2/files/0x000e00000001c5c2-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2760	WINWORD.exe
3316	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
2924	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	2026-07-20_0045f7665ccbdf041f2e0cb5e8b93644_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
2924	cmd.exe
4172	PING.EXE
2332	PING.EXE
2848	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4172	PING.EXE
2332	PING.EXE
2848	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5908 wrote to memory of 2760	5908	2026-07-20_0045f7665ccbdf041f2e0cb5e8b93644_elex_wannacry.exe	88
PID 2760 wrote to memory of 2924	2760	WINWORD.exe	89
PID 2924 wrote to memory of 4172	2924	cmd.exe	91
PID 2924 wrote to memory of 2332	2924	cmd.exe	92
PID 2924 wrote to memory of 2848	2924	cmd.exe	93
PID 2924 wrote to memory of 3316	2924	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-20_0045f7665ccbdf041f2e0cb5e8b93644_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_0045f7665ccbdf041f2e0cb5e8b93644_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5908
- 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:2760
- - 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\00006D77" 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:2924
  - - 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:4172
  - - 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:2332
  - - 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:2848
  - - 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:3316

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

Replay Monitor

Loading Replay Monitor...

Downloads

00006D77

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006D77
Size 64KB
SHA256 3425b1631b5e3d60a015fbc753690e0dfa27c3d14b6885f056e2c30d6fa45f78
MD5 98b2e0990fad6b283f36db80964549b0
SHA1 55aeabf9bc578fd3ef4d93ad79955fdf057626e3
SHA512 0a22798a93bf18dd9f0ee86047fdc566159d15d3f051b3fc25c6bd49da84db51a32bf708e045c42968eecd9d94b70a8206ad15f8de4c7b33b362c144ce7b95e4
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/um:sLy2Kerc64CiGIm8so28m
TLSH
T124535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 558e4d251564055ac71a998e18f17fc519ef15230b4f071dfedea6722be0113d
MD5 0045f7665ccbdf041f2e0cb5e8b93644
SHA1 c5b7fd2a8622499b90f12643a7b1ff2764777cfa
SHA512 a24413dab28400fb3eddff8f19f17e3ba79f757eb566c4a7349b406fa9d0901c82132e221b562a24b4744088cdf119e8d46050fbb066838c5a5f00e7adc08ad5
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uW:sLy2Kerc64CiGIm8so28W
TLSH
T19B535C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads