juko | 7a8e12ef49887a8b1ff40a04b1fbe47c25e28c47692476f696bdb5770c8df901

General

Target
2026-07-19_156e84583395b402acd57cc0d088e93d_elex_wannacry.exe
Size 68KB
Sample260719-3hse2sf14j
SHA256 7a8e12ef49887a8b1ff40a04b1fbe47c25e28c47692476f696bdb5770c8df901
MD5 156e84583395b402acd57cc0d088e93d
SHA1 2ebdc95f54251b8852adcef63c7328604962c4f2
SHA512 01cacc1a6494b681999b12985f12a5fc0acab15f7408cab9f3c53853539393b5676e6cb81dc40f44f3ed050ce98f88331476f8506827f833bac9b4c2d53ff7dc
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpM:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpM
TLSH
T16363A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
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/1132-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x00090000000004eb-5.dat	family_juko
behavioral1/memory/1132-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4744-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000b00000001e415-15.dat	family_juko
behavioral1/memory/2892-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/2892-18-0x0000000000400000-0x0000000000425000-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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-07-19_156e84583395b402acd57cc0d088e93d_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4744	WINWORD.exe
2892	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-1-5-21-1074038928-2032447174-945360078-1000\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
1080	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-19_156e84583395b402acd57cc0d088e93d_elex_wannacry.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
1080	cmd.exe
1688	PING.EXE
4260	PING.EXE
700	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1688	PING.EXE
4260	PING.EXE
700	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1132 wrote to memory of 4744	1132	2026-07-19_156e84583395b402acd57cc0d088e93d_elex_wannacry.exe	84
PID 4744 wrote to memory of 1080	4744	WINWORD.exe	85
PID 1080 wrote to memory of 1688	1080	cmd.exe	87
PID 1080 wrote to memory of 4260	1080	cmd.exe	91
PID 1080 wrote to memory of 700	1080	cmd.exe	94
PID 1080 wrote to memory of 2892	1080	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-19_156e84583395b402acd57cc0d088e93d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-19_156e84583395b402acd57cc0d088e93d_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1132
- 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:4744
- - 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\000078F2" 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:1080
  - - 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:1688
  - - 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:4260
  - - 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:700
  - - 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:2892

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

Replay Monitor

Loading Replay Monitor...

Downloads

000078F2

Path C:\Users\Admin\AppData\Roaming\Mozilla\000078F2
Size 68KB
SHA256 fc233867e4583f01b8cbf15e8b5b643e3c92e149a734f883e94d579bbafd6994
MD5 20b3981814cc2ed7704ea39825c79e8f
SHA1 958987b1a81a0c2dfd20463d6bdf5a4e4367cf95
SHA512 ab5ff3dbfc6f8501051cb17fc6bba3f1fb4e3dc1a7731739b00cb2ac2bf770e6bdc0dfa7fdf42843938d00c495d825f7b6b2d85d888d686c25e2f462e4b667f9
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpJ:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpJ
TLSH
T1BA63A0B629761011C48BD478E8186A60B933DCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 7a8e12ef49887a8b1ff40a04b1fbe47c25e28c47692476f696bdb5770c8df901
MD5 156e84583395b402acd57cc0d088e93d
SHA1 2ebdc95f54251b8852adcef63c7328604962c4f2
SHA512 01cacc1a6494b681999b12985f12a5fc0acab15f7408cab9f3c53853539393b5676e6cb81dc40f44f3ed050ce98f88331476f8506827f833bac9b4c2d53ff7dc
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpM:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpM
TLSH
T16363A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1132-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1132-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2892-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2892-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4744-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads