juko | 5f82571f73390f070c6eb6a14bfd709b5c7902affa76d6ec7754fc20736d20b7

General

Target
2026-08-23_f68ef5cd19bb84ae873bbda222a6c105_elex_wannacry.exe
Size 37KB
Sample260823-sm18msaf39
SHA256 5f82571f73390f070c6eb6a14bfd709b5c7902affa76d6ec7754fc20736d20b7
MD5 f68ef5cd19bb84ae873bbda222a6c105
SHA1 2b13a6d2348289afa2fc495b0acac591047579b0
SHA512 dfd709bdcbe0cab0135ce3988e42274a953050b4f3a80f3e2f627cab8c1adb46b7b5e7d572eac9d2b8f7643346adea7ac41202cad2bd3f19a12a3e5351b56404
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywap:3LsF2Kerc64sTiX2IV0DhuogwW
TLSH
T10A035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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
behavioral1/memory/2852-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000b0000000242fc-5.dat	family_juko
behavioral1/memory/2852-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3852-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000a000000024495-15.dat	family_juko
behavioral1/memory/4400-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4400-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-08-23_f68ef5cd19bb84ae873bbda222a6c105_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3852	WINWORD.exe
4400	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-1-5-21-668679576-120646659-2289335452-1000\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
3240	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	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	2026-08-23_f68ef5cd19bb84ae873bbda222a6c105_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
3240	cmd.exe
640	PING.EXE
1792	PING.EXE
620	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
640	PING.EXE
1792	PING.EXE
620	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2852 wrote to memory of 3852	2852	2026-08-23_f68ef5cd19bb84ae873bbda222a6c105_elex_wannacry.exe	86
PID 3852 wrote to memory of 3240	3852	WINWORD.exe	87
PID 3240 wrote to memory of 640	3240	cmd.exe	89
PID 3240 wrote to memory of 1792	3240	cmd.exe	90
PID 3240 wrote to memory of 620	3240	cmd.exe	91
PID 3240 wrote to memory of 4400	3240	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-08-23_f68ef5cd19bb84ae873bbda222a6c105_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-23_f68ef5cd19bb84ae873bbda222a6c105_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2852
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3852
- - 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\00003A7B" 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:3240
  - - 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:640
  - - 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:1792
  - - 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:620
  - - 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:4400

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00003A7B

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003A7B
Size 37KB
SHA256 ff840b23c3f0c5b0e4e8743b76480d9e6fa34dd0d0a956adce2acf4142cba2c1
MD5 5f50cb4e5cd9f24611c80730cf64c370
SHA1 8750cb644f9fe41b03d2e00c66782445aa15779d
SHA512 2b30264abe53f3667ef2efc135885a22bd475c7418d78d226caad9347f5e853d32d2a75c17b28b3af8489a01cba4f3a2409b6629f2932c58f523691c7af6db94
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaP:3LsF2Kerc64sTiX2IV0DhuogwE
TLSH
T1CE035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 5f82571f73390f070c6eb6a14bfd709b5c7902affa76d6ec7754fc20736d20b7
MD5 f68ef5cd19bb84ae873bbda222a6c105
SHA1 2b13a6d2348289afa2fc495b0acac591047579b0
SHA512 dfd709bdcbe0cab0135ce3988e42274a953050b4f3a80f3e2f627cab8c1adb46b7b5e7d572eac9d2b8f7643346adea7ac41202cad2bd3f19a12a3e5351b56404
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywap:3LsF2Kerc64sTiX2IV0DhuogwW
TLSH
T10A035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2852-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2852-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3852-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4400-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4400-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads