juko | 19d8790a8458b64c848e7d5490f272d97f54f3faf5ebfca4bfebc14d92806d90

General

Target
2026-05-29_e61fac2969ef06d398864f6f5960c39a_elex_wannacry.exe
Size 30KB
Sample260529-2rv2vsbt7t
SHA256 19d8790a8458b64c848e7d5490f272d97f54f3faf5ebfca4bfebc14d92806d90
MD5 e61fac2969ef06d398864f6f5960c39a
SHA1 bd42c9356e438cdd05f0af245c85be7cfd26a15f
SHA512 b3be1c110759ced33a5a8c4643ec4d0e372269031fca2f69f32cf68696bf569405a743f501578881e02f25a3b6b359a095ae4bf49a91db10d68959db31c2366b
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX/:tLsF2Kerc64sTiX2IV0Dzlo/
TLSH
T11FE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x0012000000025ee6-4.dat	family_juko
behavioral2/files/0x000400000002a8f9-9.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5860	WINWORD.exe
5424	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-1-5-21-1768642833-2142038154-4041560723-1000\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	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	2026-05-29_e61fac2969ef06d398864f6f5960c39a_elex_wannacry.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
5600	cmd.exe
5116	PING.EXE
4348	PING.EXE
4344	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5116	PING.EXE
4348	PING.EXE
4344	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5724 wrote to memory of 5860	5724	2026-05-29_e61fac2969ef06d398864f6f5960c39a_elex_wannacry.exe	80
PID 5860 wrote to memory of 5600	5860	WINWORD.exe	81
PID 5600 wrote to memory of 5116	5600	cmd.exe	83
PID 5600 wrote to memory of 4348	5600	cmd.exe	84
PID 5600 wrote to memory of 4344	5600	cmd.exe	85
PID 5600 wrote to memory of 5424	5600	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-29_e61fac2969ef06d398864f6f5960c39a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-29_e61fac2969ef06d398864f6f5960c39a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5724
- 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:5860
- - 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\00007707" 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:5600
  - - 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:5116
  - - 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:4348
  - - 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:4344
  - - 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:5424

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

00007707

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007707
Size 30KB
SHA256 fa34a6d23922c6a70a9e802802fa28e5531fb552d05ac5bb86a54fdcf9b5a02b
MD5 fe3911dbab5177fbd91fadb44f3c6e63
SHA1 492a01fca23e052c51f4047e9d7c972e54c65416
SHA512 df151cd00949fad8cde75a7ba4ed39fedb8f41e9e74b03f704c5b811ce3f20b67a674a7b970a8d0c083a874033d2cf61f76d91c1dd11280fe69b05a489c315f8
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXy:tLsF2Kerc64sTiX2IV0Dzloy
TLSH
T107E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 19d8790a8458b64c848e7d5490f272d97f54f3faf5ebfca4bfebc14d92806d90
MD5 e61fac2969ef06d398864f6f5960c39a
SHA1 bd42c9356e438cdd05f0af245c85be7cfd26a15f
SHA512 b3be1c110759ced33a5a8c4643ec4d0e372269031fca2f69f32cf68696bf569405a743f501578881e02f25a3b6b359a095ae4bf49a91db10d68959db31c2366b
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX/:tLsF2Kerc64sTiX2IV0Dzlo/
TLSH
T11FE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads