juko | 2f6c3abdd241c4b3b340a1880ad705d62487e70387869c74fcc68fa40f50ac8b

General

Target
2026-10-10_b94ae886b5e54e998d161f2d08ea67fb_elex_wannacry.exe
Size 115KB
Sample261011-exp2gaxy9j
SHA256 2f6c3abdd241c4b3b340a1880ad705d62487e70387869c74fcc68fa40f50ac8b
MD5 b94ae886b5e54e998d161f2d08ea67fb
SHA1 5d007380167a2b7d29af680705efbfd5497bbcab
SHA512 35c20f2e982931fe053d8c13163cc9a89a3788c97bf90790b35eab878b863c350a1e927c42746f179b73bb18d8ce5c530144209192aa42a738fa88639db2f531
SSDEEP 3072:vLy2Kerc64CiGImVuX/N81rRLoPshIPFJRAhP2EAekV:vLy2Kwc64YIweIFsDeP4
TLSH
T167B3AE06FBDC4F91F44A0970CA7B0A74607D6CB55527E22BB380361E2D72B529F23A9D
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 6 IoCs

resource	yara_rule
behavioral2/memory/4464-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x0007000000016b39-4.dat	family_juko
behavioral2/memory/4464-9-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/5976-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x001100000001c49f-13.dat	family_juko
behavioral2/memory/3716-16-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5976	WINWORD.exe
3716	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-1-5-21-1404337215-1550464601-2805570857-1000\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
4592	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	2026-10-10_b94ae886b5e54e998d161f2d08ea67fb_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
2660	PING.EXE
4944	PING.EXE
3392	PING.EXE
4592	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2660	PING.EXE
4944	PING.EXE
3392	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4464 wrote to memory of 5976	4464	2026-10-10_b94ae886b5e54e998d161f2d08ea67fb_elex_wannacry.exe	89
PID 5976 wrote to memory of 4592	5976	WINWORD.exe	90
PID 4592 wrote to memory of 2660	4592	cmd.exe	92
PID 4592 wrote to memory of 4944	4592	cmd.exe	93
PID 4592 wrote to memory of 3392	4592	cmd.exe	94
PID 4592 wrote to memory of 3716	4592	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-10_b94ae886b5e54e998d161f2d08ea67fb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-10_b94ae886b5e54e998d161f2d08ea67fb_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4464
- 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:5976
- - 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\00006690" 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:4592
  - - 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:2660
  - - 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:4944
  - - 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:3392
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:3716

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00006690

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006690
Size 115KB
SHA256 f471ef43408bdc174485a318e54c70162d2ed49804a75378ea2b619e18103bdd
MD5 46f8f91f8fd50781c7fd5aa4ae499471
SHA1 2126203177f7d3cab4449171328e9b07d3bf0637
SHA512 176038fdf3d15120c9598f0e2e8d056d2266c46d41ce9705743f343d8de302a6113035e497bb9c7c00878efd22c6955dad6953339ffc65c084e926734b45b590
SSDEEP 3072:vLy2Kerc64CiGImVuX/N81rRLoPshIPFJRAhP2EAek6:vLy2Kwc64YIweIFsDePX
TLSH
T1A3B3AE06FBDC4F91F44A0970CA7B0A74607D6CB55527E22BB380361E2D72B529F23A9D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 115KB
SHA256 2f6c3abdd241c4b3b340a1880ad705d62487e70387869c74fcc68fa40f50ac8b
MD5 b94ae886b5e54e998d161f2d08ea67fb
SHA1 5d007380167a2b7d29af680705efbfd5497bbcab
SHA512 35c20f2e982931fe053d8c13163cc9a89a3788c97bf90790b35eab878b863c350a1e927c42746f179b73bb18d8ce5c530144209192aa42a738fa88639db2f531
SSDEEP 3072:vLy2Kerc64CiGImVuX/N81rRLoPshIPFJRAhP2EAekV:vLy2Kwc64YIweIFsDeP4
TLSH
T167B3AE06FBDC4F91F44A0970CA7B0A74607D6CB55527E22BB380361E2D72B529F23A9D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3716-16-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/4464-0-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/4464-9-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/5976-12-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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