juko | 174d85a189a48d1e14a03aac3d5d2fbec363b33deb86a42555efb4d19260cd72

General

Target
2026-08-08_6a42c2d1511adb2279090765480bbd26_elex_wannacry.exe
Size 37KB
Sample260808-kten8atcmc
SHA256 174d85a189a48d1e14a03aac3d5d2fbec363b33deb86a42555efb4d19260cd72
MD5 6a42c2d1511adb2279090765480bbd26
SHA1 2d7db772ca2d10c6a5cdb7b497dde57954ef9d9c
SHA512 5ce22c1460ac44fb84cec4a99923e7ac216af4d13962ab149e79789d21c182e15fcb3adaa1057720f66f458d7226121cccc40ed29931f676e96ef9636a0c010e
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywah:3LsF2Kerc64sTiX2IV0Dhuogwm
TLSH
T13F035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/3436-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b89b-5.dat	family_juko
behavioral2/memory/3436-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/928-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c495-13.dat	family_juko
behavioral2/memory/2556-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2556-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
928	WINWORD.exe
2556	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-1-5-21-3797332335-34111092-3597280141-1000\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
5236	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-08_6a42c2d1511adb2279090765480bbd26_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
5236	cmd.exe
2020	PING.EXE
1060	PING.EXE
1752	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2020	PING.EXE
1060	PING.EXE
1752	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3436 wrote to memory of 928	3436	2026-08-08_6a42c2d1511adb2279090765480bbd26_elex_wannacry.exe	89
PID 928 wrote to memory of 5236	928	WINWORD.exe	90
PID 5236 wrote to memory of 2020	5236	cmd.exe	92
PID 5236 wrote to memory of 1060	5236	cmd.exe	93
PID 5236 wrote to memory of 1752	5236	cmd.exe	94
PID 5236 wrote to memory of 2556	5236	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_6a42c2d1511adb2279090765480bbd26_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_6a42c2d1511adb2279090765480bbd26_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3436
- 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:928
- - 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\00000198" 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:5236
  - - 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:2020
  - - 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:1060
  - - 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:1752
  - - 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:2556

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

00000198

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000198
Size 37KB
SHA256 42a13c96c792686f729e93e40c75ae0a4640836097eb731fde83598f11ab259a
MD5 9954f44914be9b002bacc232ea435750
SHA1 adbaa9ef46f98eea9322709b7236b39497332652
SHA512 01cfac9611db64013092fecf54e73ce5db0efc54453375e119b29caa8fa383d63cc28fb37544ff11d7f576375b43dfd780eb2dcb4ea3fb32a1ffc54e913cb52a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywag:3LsF2Kerc64sTiX2IV0DhuogwX
TLSH
T166035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 174d85a189a48d1e14a03aac3d5d2fbec363b33deb86a42555efb4d19260cd72
MD5 6a42c2d1511adb2279090765480bbd26
SHA1 2d7db772ca2d10c6a5cdb7b497dde57954ef9d9c
SHA512 5ce22c1460ac44fb84cec4a99923e7ac216af4d13962ab149e79789d21c182e15fcb3adaa1057720f66f458d7226121cccc40ed29931f676e96ef9636a0c010e
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywah:3LsF2Kerc64sTiX2IV0Dhuogwm
TLSH
T13F035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/928-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2556-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2556-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3436-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3436-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads