juko | 78983d0b239b9803cb66831fbf7d30967659c54c4dae54287b274ac855018c2f

General

Target
2026-04-24_db39a8993f072dae1ec0e21684d657d9_elex_glassworm_wannacry.exe
Size 194KB
Sample260424-qs8tkab12q
SHA256 78983d0b239b9803cb66831fbf7d30967659c54c4dae54287b274ac855018c2f
MD5 db39a8993f072dae1ec0e21684d657d9
SHA1 7ed95c3a9d8f9538113927a1c86c5494e10ce5e4
SHA512 18549dbe9609524f9ce0045caa2cb182c1de5185e70aebe5c392716292c606f00c3234456dfb5e5e627a4b797ddc5503c9a95ca7017177a94bf05c5bbfaf766d
SSDEEP 3072:8Ly2Kerc64CiGImStfHLREJ5itGNbg5uF1dphh1PBDp9Dwqo/zc/9yH8Ka193eTM:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5Kj
TLSH
T186147CDAF7623112C45B0A39A7665F189838EC760393651966C0F16C2C7B8B9832FFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/4724-0-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/files/0x001f00000002b18c-5.dat	family_juko
behavioral2/memory/4724-12-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/memory/1436-14-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b40c-15.dat	family_juko
behavioral2/memory/2380-17-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/memory/2380-18-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1436	WINWORD.exe
2380	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-1-5-21-3119821332-640943685-2562343641-1000\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

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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-24_db39a8993f072dae1ec0e21684d657d9_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

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
648	PING.EXE
2300	cmd.exe
3896	PING.EXE
464	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3896	PING.EXE
464	PING.EXE
648	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4724 wrote to memory of 1436	4724	2026-04-24_db39a8993f072dae1ec0e21684d657d9_elex_glassworm_wannacry.exe	79
PID 1436 wrote to memory of 2300	1436	WINWORD.exe	80
PID 2300 wrote to memory of 3896	2300	cmd.exe	82
PID 2300 wrote to memory of 464	2300	cmd.exe	83
PID 2300 wrote to memory of 648	2300	cmd.exe	84
PID 2300 wrote to memory of 2380	2300	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-24_db39a8993f072dae1ec0e21684d657d9_elex_glassworm_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-24_db39a8993f072dae1ec0e21684d657d9_elex_glassworm_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4724
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1436
- - 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\00000D31" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2300
  - - 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:3896
  - - 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:464
  - - 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:648
  - - 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:2380

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00000D31

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000D31
Size 194KB
SHA256 4a66fe672ab51b40d8883810ad0f08c144a8171a4a3836400f93b792d14edc87
MD5 445f764ce328954c51606b032647296e
SHA1 32e8b9734f27af76449023681b57606ee8e39d43
SHA512 84037c18804c1f9e5df256725127b63aad97baea03b12f4c96eff9f2276a620b1475d51b77a4de40e801854b034339a591919af46baea60c3534ba2e675d5e58
SSDEEP 3072:8Ly2Kerc64CiGImStfHLREJ5itGNbg5uF1dphh1PBDp9Dwqo/zc/9yH8Ka193eTx:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5KO
TLSH
T1BF147CDAF7623112C45B0A39A7665F189838EC760393651966C0F16C2C7B8B9832FFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 194KB
SHA256 78983d0b239b9803cb66831fbf7d30967659c54c4dae54287b274ac855018c2f
MD5 db39a8993f072dae1ec0e21684d657d9
SHA1 7ed95c3a9d8f9538113927a1c86c5494e10ce5e4
SHA512 18549dbe9609524f9ce0045caa2cb182c1de5185e70aebe5c392716292c606f00c3234456dfb5e5e627a4b797ddc5503c9a95ca7017177a94bf05c5bbfaf766d
SSDEEP 3072:8Ly2Kerc64CiGImStfHLREJ5itGNbg5uF1dphh1PBDp9Dwqo/zc/9yH8Ka193eTM:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5Kj
TLSH
T186147CDAF7623112C45B0A39A7665F189838EC760393651966C0F16C2C7B8B9832FFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1436-14-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/2380-17-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/2380-18-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/4724-0-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/4724-12-0x0000000000400000-0x0000000000445000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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