juko | 1fac7677042823dc7f5406f7daccd0b9e4d2c981b2c1806be5d476761d226024

General

Target
2026-08-28_306d3360609667518d0651f23e3a60fd_elex_glassworm_wannacry.exe
Size 194KB
Sample260828-x1hexadp21
SHA256 1fac7677042823dc7f5406f7daccd0b9e4d2c981b2c1806be5d476761d226024
MD5 306d3360609667518d0651f23e3a60fd
SHA1 6422be4764899592ba2d63e4b7bc7fc2b97ea2a6
SHA512 414a517095ea3622daf5d14815bb5b94b073358034b58c4a3ff5be26639ee4de90fda7a2db6cc5011223ae08b2bdf6effcea0710f3365e95ead54c5c4cba0f48
SSDEEP 3072:8Ly2Kerc64CiGImStfHLREJ5itGNbg5uF1dphh1PBDp9Dwqo/zc/9yH8Ka193eTS:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5KZ
TLSH
T189147CDAF7623112C45B0A39A7665F189838EC760393651966C0F16C2C7B8B9832FFDC
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/2980-0-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral1/files/0x000c000000023f94-5.dat	family_juko
behavioral1/memory/5072-12-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral1/memory/2980-13-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral1/memory/5072-15-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral1/files/0x000300000001e697-16.dat	family_juko
behavioral1/memory/1460-18-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral1/memory/1460-19-0x0000000000400000-0x0000000000445000-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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-08-28_306d3360609667518d0651f23e3a60fd_elex_glassworm_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5072	WINWORD.exe
1460	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-1-5-21-889581200-2041691093-2048517887-1000\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
4272	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	2026-08-28_306d3360609667518d0651f23e3a60fd_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
1524	PING.EXE
4272	cmd.exe
2692	PING.EXE
4668	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2692	PING.EXE
4668	PING.EXE
1524	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2980 wrote to memory of 5072	2980	2026-08-28_306d3360609667518d0651f23e3a60fd_elex_glassworm_wannacry.exe	86
PID 5072 wrote to memory of 4272	5072	WINWORD.exe	88
PID 4272 wrote to memory of 2692	4272	cmd.exe	90
PID 4272 wrote to memory of 4668	4272	cmd.exe	92
PID 4272 wrote to memory of 1524	4272	cmd.exe	93
PID 4272 wrote to memory of 1460	4272	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-28_306d3360609667518d0651f23e3a60fd_elex_glassworm_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-28_306d3360609667518d0651f23e3a60fd_elex_glassworm_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2980
- 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:5072
- - 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\00000655" 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:4272
  - - 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:2692
  - - 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:4668
  - - 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:\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:1460

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

00000655

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000655
Size 194KB
SHA256 a681d8cd228b0c0192d30168cbf7151c544f4a2e270bc0554c1abdb7b62e383c
MD5 7c224da32b7d1880cbe8f4031df03e09
SHA1 d287e5ac587196ee32c869bb4ef90b2f566fb5cd
SHA512 44d1db9f06d99a141b691abec616ec8366930d0cea6dfce76493d0c8245a1bd697870c568c52bdbf92240764326217d3b0a7c0e394a4f0ed911d949a94ff2c6f
SSDEEP 3072:8Ly2Kerc64CiGImStfHLREJ5itGNbg5uF1dphh1PBDp9Dwqo/zc/9yH8Ka193eTG:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5Kp
TLSH
T156147CDAF7623112C45B0A39A7665F189838EC760393651966C0F16C2C7B8B9832FFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 194KB
SHA256 1fac7677042823dc7f5406f7daccd0b9e4d2c981b2c1806be5d476761d226024
MD5 306d3360609667518d0651f23e3a60fd
SHA1 6422be4764899592ba2d63e4b7bc7fc2b97ea2a6
SHA512 414a517095ea3622daf5d14815bb5b94b073358034b58c4a3ff5be26639ee4de90fda7a2db6cc5011223ae08b2bdf6effcea0710f3365e95ead54c5c4cba0f48
SSDEEP 3072:8Ly2Kerc64CiGImStfHLREJ5itGNbg5uF1dphh1PBDp9Dwqo/zc/9yH8Ka193eTS:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5KZ
TLSH
T189147CDAF7623112C45B0A39A7665F189838EC760393651966C0F16C2C7B8B9832FFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1460-18-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/1460-19-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/2980-0-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/2980-13-0x0000000000400000-0x0000000000445000-memory.dmp

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memory/5072-12-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/5072-15-0x0000000000400000-0x0000000000445000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads