juko | b081a32f013d15264dde50c235da44f092472b63edca3f1b8098a7ac9bc30422

General

Target
2026-08-17_0f6947287c8976720b7d7bf0e6e08a3f_elex_wannacry.exe
Size 37KB
Sample260817-lbsnssae49
SHA256 b081a32f013d15264dde50c235da44f092472b63edca3f1b8098a7ac9bc30422
MD5 0f6947287c8976720b7d7bf0e6e08a3f
SHA1 4d3598b86e509e3ba3071fbf073e7cbe6b14a8c3
SHA512 0ccd9f062e9f077168784c6e30c2ed534fe6f85c58d28244a07c8da24e8dd50efda9131f78c6e7fb017f68d2f9774c39951f3ea2f267543403cf1aad521dd225
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa3:3LsF2Kerc64sTiX2IV0Dhuogws
TLSH
T157035C1A299160A2D55310B0E9D81FB4C53D4C76106BB062F740BE59A8B3CD7DF72BCE
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/4260-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000900000001b858-5.dat	family_juko
behavioral2/memory/4260-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2072-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c329-13.dat	family_juko
behavioral2/memory/3332-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3332-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2072	WINWORD.exe
3332	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-1-5-21-2301830172-776172150-2531349243-1000\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
3780	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	2026-08-17_0f6947287c8976720b7d7bf0e6e08a3f_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
5260	PING.EXE
1580	PING.EXE
3780	cmd.exe
1524	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5260	PING.EXE
1580	PING.EXE
1524	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4260 wrote to memory of 2072	4260	2026-08-17_0f6947287c8976720b7d7bf0e6e08a3f_elex_wannacry.exe	89
PID 2072 wrote to memory of 3780	2072	WINWORD.exe	90
PID 3780 wrote to memory of 1524	3780	cmd.exe	92
PID 3780 wrote to memory of 5260	3780	cmd.exe	93
PID 3780 wrote to memory of 1580	3780	cmd.exe	94
PID 3780 wrote to memory of 3332	3780	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-17_0f6947287c8976720b7d7bf0e6e08a3f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-17_0f6947287c8976720b7d7bf0e6e08a3f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4260
- 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:2072
- - 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\00002E14" 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:3780
  - - 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:1524
  - - 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:5260
  - - 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:1580
  - - 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:3332

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

00002E14

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002E14
Size 37KB
SHA256 8bece6120a785543b6159241ac8c84333965f6de1d705c7ca38fe0393ebfb58f
MD5 ffd3aead2ba1520d559d4faf574d3c51
SHA1 4962c5a9e24962e1416637ba17357d266a175dc1
SHA512 36116c3b76b578e7f2b15fea11d7edaedcb8f056c8cda515e302ec24cc9dd6203322d35ccb89f52f1d7d7f1e0653b22b54e9f152d8f808f5fad655acca762cf2
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywar:3LsF2Kerc64sTiX2IV0Dhuogwo
TLSH
T193035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 b081a32f013d15264dde50c235da44f092472b63edca3f1b8098a7ac9bc30422
MD5 0f6947287c8976720b7d7bf0e6e08a3f
SHA1 4d3598b86e509e3ba3071fbf073e7cbe6b14a8c3
SHA512 0ccd9f062e9f077168784c6e30c2ed534fe6f85c58d28244a07c8da24e8dd50efda9131f78c6e7fb017f68d2f9774c39951f3ea2f267543403cf1aad521dd225
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa3:3LsF2Kerc64sTiX2IV0Dhuogws
TLSH
T157035C1A299160A2D55310B0E9D81FB4C53D4C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2072-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3332-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3332-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4260-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4260-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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