juko | f9b6acf4e8481223f4905cb79fba51a13bcf06d774a60231d6658dd7bd5fbf02

General

Target
2026-08-04_a97acf116daada40a7abfe31fce45c53_elex_glassworm_wannacry.exe
Size 211KB
Sample260804-gnjjfaea34
SHA256 f9b6acf4e8481223f4905cb79fba51a13bcf06d774a60231d6658dd7bd5fbf02
MD5 a97acf116daada40a7abfe31fce45c53
SHA1 2f0891b385cc84132a88e59654c75a3b202318f5
SHA512 900be0b53397924ab15440593131787e3da8511495b91b23c0b8e3c396156085b9f8c647cf2728ec2d7cf6f2361d468d1e6df40f061d537be136ef3ce685c022
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qo8:jkwcEO28wzmJje7Rsei5dho8
TLSH
T1C4246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
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/4608-0-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral1/files/0x001200000002435f-5.dat	family_juko
behavioral1/memory/4608-13-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral1/memory/4756-12-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral1/memory/4756-15-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral1/files/0x00090000000245dd-16.dat	family_juko
behavioral1/memory/1192-18-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral1/memory/1192-19-0x0000000000400000-0x000000000044A000-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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	2026-08-04_a97acf116daada40a7abfe31fce45c53_elex_glassworm_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4756	WINWORD.exe
1192	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-1-5-21-540052884-2969440504-464782435-1000\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
4936	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	2026-08-04_a97acf116daada40a7abfe31fce45c53_elex_glassworm_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
4936	cmd.exe
1440	PING.EXE
1884	PING.EXE
820	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1440	PING.EXE
1884	PING.EXE
820	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4608 wrote to memory of 4756	4608	2026-08-04_a97acf116daada40a7abfe31fce45c53_elex_glassworm_wannacry.exe	84
PID 4756 wrote to memory of 4936	4756	WINWORD.exe	85
PID 4936 wrote to memory of 1440	4936	cmd.exe	87
PID 4936 wrote to memory of 1884	4936	cmd.exe	90
PID 4936 wrote to memory of 820	4936	cmd.exe	92
PID 4936 wrote to memory of 1192	4936	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-04_a97acf116daada40a7abfe31fce45c53_elex_glassworm_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_a97acf116daada40a7abfe31fce45c53_elex_glassworm_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4608
- 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:4756
- - 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\0000445B" 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:4936
  - - 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:1440
  - - 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:1884
  - - 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:820
  - - 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:1192

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

0000445B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000445B
Size 211KB
SHA256 c669267663aee29fe9dfdaf0b55caa508924f7477f579920945c7977b41313a9
MD5 e8d5f3cbcbc5815e7b32ddf2622d4734
SHA1 80fbf3aa49bda8e12934a720687d048cf4aaabb8
SHA512 0650eb7ef66e77ccc1ee99de01d106f48105a7088d38ae13efafbc943adb167a97772393c27a14c441a465c91785c5c8969089b84a8dcee4adc6dd47e91e29cd
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qoX:jkwcEO28wzmJje7Rsei5dhoX
TLSH
T14D246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 211KB
SHA256 f9b6acf4e8481223f4905cb79fba51a13bcf06d774a60231d6658dd7bd5fbf02
MD5 a97acf116daada40a7abfe31fce45c53
SHA1 2f0891b385cc84132a88e59654c75a3b202318f5
SHA512 900be0b53397924ab15440593131787e3da8511495b91b23c0b8e3c396156085b9f8c647cf2728ec2d7cf6f2361d468d1e6df40f061d537be136ef3ce685c022
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qo8:jkwcEO28wzmJje7Rsei5dho8
TLSH
T1C4246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1192-18-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/1192-19-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/4608-0-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/4608-13-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/4756-12-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/4756-15-0x0000000000400000-0x000000000044A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads