juko | 15d17f051815002629e8d7c12183fc9b479af97d2a31ba85517f52cfd513086a

General

Target
2026-07-30_8d6c435a77feb52f4f7143f303793088_elex_wannacry.exe
Size 87KB
Sample260730-krt15avbla
SHA256 15d17f051815002629e8d7c12183fc9b479af97d2a31ba85517f52cfd513086a
MD5 8d6c435a77feb52f4f7143f303793088
SHA1 44cf8af82724d8425c2706be4f042bb0de0ae16b
SHA512 d44feb672863b8681c6919388b3acebf75dc6c29f0c0a8e28a83c20cb2c14c09d280adde011aa804b281f07a438f603d536cf06331daef7711ef39f9c6db1d9d
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpj:2Ly2Kerc64CiGIm1K851YO6EQkwpj
TLSH
T1C493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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 8 IoCs

resource	yara_rule
behavioral1/memory/1828-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x00110000000231f3-5.dat	family_juko
behavioral1/memory/4740-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/1828-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4740-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000a0000000244fd-16.dat	family_juko
behavioral1/memory/1504-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/1504-19-0x0000000000400000-0x0000000000425000-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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-07-30_8d6c435a77feb52f4f7143f303793088_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4740	WINWORD.exe
1504	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-1-5-21-3053180483-1881419501-3594244048-1000\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
5836	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-30_8d6c435a77feb52f4f7143f303793088_elex_wannacry.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
5836	cmd.exe
3580	PING.EXE
6092	PING.EXE
2080	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3580	PING.EXE
6092	PING.EXE
2080	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1828 wrote to memory of 4740	1828	2026-07-30_8d6c435a77feb52f4f7143f303793088_elex_wannacry.exe	84
PID 4740 wrote to memory of 5836	4740	WINWORD.exe	86
PID 5836 wrote to memory of 3580	5836	cmd.exe	88
PID 5836 wrote to memory of 6092	5836	cmd.exe	90
PID 5836 wrote to memory of 2080	5836	cmd.exe	93
PID 5836 wrote to memory of 1504	5836	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-07-30_8d6c435a77feb52f4f7143f303793088_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_8d6c435a77feb52f4f7143f303793088_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1828
- 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:4740
- - 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\00006AB6" 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:5836
  - - 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:3580
  - - 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:6092
  - - 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:2080
  - - 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:1504

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

00006AB6

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006AB6
Size 87KB
SHA256 35f78deef2a5e20f4fc6d8fda9ef56213795220fdb0c49fac89979f702d232ee
MD5 cdff979513c2747db2aaea47964abe53
SHA1 71e4aa57360f627645e9f1ba7f122ec2d332449d
SHA512 df9a4fde665ec9e701299e53b0d57fb9597fe5c9ca14058fbf53c24275e9d07e65e06904191af5728356fba99206334ad7c8aa5c5eed165c170a80c7172d3eca
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpF:2Ly2Kerc64CiGIm1K851YO6EQkwpF
TLSH
T14893A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 15d17f051815002629e8d7c12183fc9b479af97d2a31ba85517f52cfd513086a
MD5 8d6c435a77feb52f4f7143f303793088
SHA1 44cf8af82724d8425c2706be4f042bb0de0ae16b
SHA512 d44feb672863b8681c6919388b3acebf75dc6c29f0c0a8e28a83c20cb2c14c09d280adde011aa804b281f07a438f603d536cf06331daef7711ef39f9c6db1d9d
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpj:2Ly2Kerc64CiGIm1K851YO6EQkwpj
TLSH
T1C493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1504-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1504-19-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1828-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1828-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4740-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4740-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads