juko | 3a1effde5b614501a6b1a5a544e51999b978c9e64924a9538b431b2f6c484bd2

General

Target
2026-07-27_bcdc1dd0f1c13463510ef47fbe44274c_elex_wannacry.exe
Size 87KB
Sample260727-lcdk9scl8t
SHA256 3a1effde5b614501a6b1a5a544e51999b978c9e64924a9538b431b2f6c484bd2
MD5 bcdc1dd0f1c13463510ef47fbe44274c
SHA1 b92d821815d8e65027ddc0de0ea3165431920e2f
SHA512 1383a9d43c10c31230396cfec67fbc6403fbecc1d6acac1df272c4397deb1ddfd535ea13eab21eda93807b1c07e457b9bc4258ae1f31acf6ea4094ad825c6a2e
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpY:2Ly2Kerc64CiGIm1K851YO6EQkwpY
TLSH
T10593A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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 7 IoCs

resource	yara_rule
behavioral2/memory/5732-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x0009000000016cdf-5.dat	family_juko
behavioral2/memory/5732-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4252-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c589-13.dat	family_juko
behavioral2/memory/5064-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5064-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4252	WINWORD.exe
5064	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-1-5-21-552508041-2681165170-3229858294-1000\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
4432	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	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	2026-07-27_bcdc1dd0f1c13463510ef47fbe44274c_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

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
4432	cmd.exe
2056	PING.EXE
3432	PING.EXE
4904	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2056	PING.EXE
3432	PING.EXE
4904	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5732 wrote to memory of 4252	5732	2026-07-27_bcdc1dd0f1c13463510ef47fbe44274c_elex_wannacry.exe	89
PID 4252 wrote to memory of 4432	4252	WINWORD.exe	90
PID 4432 wrote to memory of 2056	4432	cmd.exe	92
PID 4432 wrote to memory of 3432	4432	cmd.exe	93
PID 4432 wrote to memory of 4904	4432	cmd.exe	94
PID 4432 wrote to memory of 5064	4432	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-27_bcdc1dd0f1c13463510ef47fbe44274c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_bcdc1dd0f1c13463510ef47fbe44274c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5732
- 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:4252
- - 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\00007FAE" 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:4432
  - - 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:2056
  - - 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:3432
  - - 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:4904
  - - 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:5064

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

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

00007FAE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007FAE
Size 87KB
SHA256 9caa167a97f9b63c7b2fa1a0276684e70eaeb1668b9f793d122887c1c1979884
MD5 5a49afcf6a9a049a01462f2c346b43a3
SHA1 ba9742e5d46fb44c3be52a1f3d96545302ec4ce8
SHA512 5e002655fd85f41c8bd1f4013f7017332bcd97d23c99119c089e584da759bcf3a23ab4f6d1dfa8279a5f851627b6a41793f26ac212e5992d45630bb24f983b2d
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpr:2Ly2Kerc64CiGIm1K851YO6EQkwpr
TLSH
T16B93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 3a1effde5b614501a6b1a5a544e51999b978c9e64924a9538b431b2f6c484bd2
MD5 bcdc1dd0f1c13463510ef47fbe44274c
SHA1 b92d821815d8e65027ddc0de0ea3165431920e2f
SHA512 1383a9d43c10c31230396cfec67fbc6403fbecc1d6acac1df272c4397deb1ddfd535ea13eab21eda93807b1c07e457b9bc4258ae1f31acf6ea4094ad825c6a2e
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpY:2Ly2Kerc64CiGIm1K851YO6EQkwpY
TLSH
T10593A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4252-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5064-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5064-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5732-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5732-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads