juko | e267097fd61174b91015e1c887021616014ebc896bfaa74f4471818a69c94c07

General

Target
2026-10-26_99d8054fd70cb33e4416e6adfd2e589f_elex_wannacry.exe
Size 90KB
Sample261027-m779sscv2t
SHA256 e267097fd61174b91015e1c887021616014ebc896bfaa74f4471818a69c94c07
MD5 99d8054fd70cb33e4416e6adfd2e589f
SHA1 cf157bf0a0a27de7cf8472422660f8527efbcb4e
SHA512 16245ec563d6921c026e3234e0473b3b52b76d6cb6e89e898e438ffa59719a7140c7a9ee8d1a4a4ed7c7a61c98043d82d393c4dc686c1f487806755b04514836
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/v:vLy2Kerc64CiGImVuX/N81rRLoPtU+3N
TLSH
T1A3933A1BF18A279CF6178274DAAA5A70A0BD7CB44533BC3E6B14F2302F71C219B25959
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/1700-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000900000001138c-4.dat	family_juko
behavioral2/memory/1700-10-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/868-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c564-13.dat	family_juko
behavioral2/memory/4544-16-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
868	WINWORD.exe
4544	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
3556	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	2026-10-26_99d8054fd70cb33e4416e6adfd2e589f_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
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

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
3556	cmd.exe
6056	PING.EXE
5932	PING.EXE
5044	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6056	PING.EXE
5932	PING.EXE
5044	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1700 wrote to memory of 868	1700	2026-10-26_99d8054fd70cb33e4416e6adfd2e589f_elex_wannacry.exe	89
PID 868 wrote to memory of 3556	868	WINWORD.exe	90
PID 3556 wrote to memory of 6056	3556	cmd.exe	92
PID 3556 wrote to memory of 5932	3556	cmd.exe	93
PID 3556 wrote to memory of 5044	3556	cmd.exe	94
PID 3556 wrote to memory of 4544	3556	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-26_99d8054fd70cb33e4416e6adfd2e589f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_99d8054fd70cb33e4416e6adfd2e589f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1700
- 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:868
- - 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\000048CB" 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:3556
  - - 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:6056
  - - 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:5932
  - - 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:5044
  - - 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:4544

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

Replay Monitor

Loading Replay Monitor...

Downloads

000048CB

Path C:\Users\Admin\AppData\Roaming\Mozilla\000048CB
Size 90KB
SHA256 4bffa7b40f6b48ecdb7d9982862d84f5381b2d0015e4b8344b807abc94d9d862
MD5 141764d3f5a32d341b0713dbf660e55a
SHA1 7a052765bc2df4fe2ade830c3c3519ecde4031e4
SHA512 7ce270c0506333cbdcbecfbf65d415daec5e9a97b4f3b3fa801dc32387119a4d147f47d4bb4dd64ce95500ab6845c1a734f9bcda862c49eaaf4e6d3f04b3bdd3
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/u:vLy2Kerc64CiGImVuX/N81rRLoPtU+3s
TLSH
T154933A1BF18A279CF6178274DAAA5A70A0BD7CB44533BC3E6B14F2302F71C219B25959
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 90KB
SHA256 e267097fd61174b91015e1c887021616014ebc896bfaa74f4471818a69c94c07
MD5 99d8054fd70cb33e4416e6adfd2e589f
SHA1 cf157bf0a0a27de7cf8472422660f8527efbcb4e
SHA512 16245ec563d6921c026e3234e0473b3b52b76d6cb6e89e898e438ffa59719a7140c7a9ee8d1a4a4ed7c7a61c98043d82d393c4dc686c1f487806755b04514836
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/v:vLy2Kerc64CiGImVuX/N81rRLoPtU+3N
TLSH
T1A3933A1BF18A279CF6178274DAAA5A70A0BD7CB44533BC3E6B14F2302F71C219B25959
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/868-12-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/1700-0-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/1700-10-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/4544-16-0x0000000000400000-0x000000000041C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads