juko | a2ea0b991cb41a14d0134e32d947f45543d81bb013ae9ba6f16488f0b601b82a

General

Target
2026-04-20_0f6aa8cc6d729620afc7374ee8c0629b_elex_wannacry.exe
Size 137KB
Sample260420-l93xesbx2w
SHA256 a2ea0b991cb41a14d0134e32d947f45543d81bb013ae9ba6f16488f0b601b82a
MD5 0f6aa8cc6d729620afc7374ee8c0629b
SHA1 44b4a249c79504de1f0a7353563a917b43c1e4ec
SHA512 7f490e42b44bac1a630c9b05125309bcc28c6c39b9cfe1b52d86410e3d31895be658a334b1f970a4c7c338dbdb7375602109f180ba0f935eea33ab4ab7ceff9b
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGga:+Ly2Kwc64YIcYjIDLCSiDaQZ
TLSH
T19AD30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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/3252-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000d000000029ee3-5.dat	family_juko
behavioral2/memory/3252-11-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/4812-14-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x001e00000002b453-15.dat	family_juko
behavioral2/memory/6012-17-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/6012-18-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4812	WINWORD.exe
6012	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-1-5-21-2397528088-2630719772-1129911217-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-20_0f6aa8cc6d729620afc7374ee8c0629b_elex_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

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
4892	PING.EXE
5320	cmd.exe
6060	PING.EXE
3716	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6060	PING.EXE
3716	PING.EXE
4892	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3252 wrote to memory of 4812	3252	2026-04-20_0f6aa8cc6d729620afc7374ee8c0629b_elex_wannacry.exe	79
PID 4812 wrote to memory of 5320	4812	WINWORD.exe	80
PID 5320 wrote to memory of 6060	5320	cmd.exe	82
PID 5320 wrote to memory of 3716	5320	cmd.exe	83
PID 5320 wrote to memory of 4892	5320	cmd.exe	84
PID 5320 wrote to memory of 6012	5320	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-20_0f6aa8cc6d729620afc7374ee8c0629b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-20_0f6aa8cc6d729620afc7374ee8c0629b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3252
- 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:4812
- - 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\00005BEC" 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:5320
  - - 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:6060
  - - 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:3716
  - - 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:4892
  - - 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:6012

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

00005BEC

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005BEC
Size 137KB
SHA256 b4980d4a99cc8890381bcf9d6f52654419c0a0807a3bf7922392af0bec74159b
MD5 ee8d3b5456310ff6ab5e4342a846fbc9
SHA1 6e47739f8014a1682c9c73d89e1f67dcc4259ea7
SHA512 fafd06f422bc89f958141fab31c4ee146799278b3c5f0a18edf93ef718c5384d8a0e65ee3609e545d6e46bef30d49780912f682358e61b458f1089a32f6292ac
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGgO:+Ly2Kwc64YIcYjIDLCSiDaQB
TLSH
T1FAD30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 137KB
SHA256 a2ea0b991cb41a14d0134e32d947f45543d81bb013ae9ba6f16488f0b601b82a
MD5 0f6aa8cc6d729620afc7374ee8c0629b
SHA1 44b4a249c79504de1f0a7353563a917b43c1e4ec
SHA512 7f490e42b44bac1a630c9b05125309bcc28c6c39b9cfe1b52d86410e3d31895be658a334b1f970a4c7c338dbdb7375602109f180ba0f935eea33ab4ab7ceff9b
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGga:+Ly2Kwc64YIcYjIDLCSiDaQZ
TLSH
T19AD30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3252-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/3252-11-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4812-14-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/6012-17-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/6012-18-0x0000000000400000-0x0000000000436000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads