juko | a3c5c4227b31d2e8ebc4e5bc716e4f7da8ccff0bb62c1fd2bdbc745af050c486

General

Target
2026-10-22_f85f04a156004082d7a354a544c45daa_elex_wannacry.exe
Size 42KB
Sample261023-btbswsg13x
SHA256 a3c5c4227b31d2e8ebc4e5bc716e4f7da8ccff0bb62c1fd2bdbc745af050c486
MD5 f85f04a156004082d7a354a544c45daa
SHA1 b1c99ace10aa59ba4906d05a9c2f1aa83faadf78
SHA512 5fd4d929aaf9890248bf731e017b96e695a8af833789a44d61eec45d623a73d4fc3cb9d7d0679b3512c42a37eaff08597cc2c942ce6b4325fbb18d764978b7f0
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41z:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+Y
TLSH
T11413171776A460D2CDB76074E91A5E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000b00000001b2e2-3.dat	family_juko
behavioral2/files/0x000e00000001c585-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2588	WINWORD.exe
6132	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-1-5-21-4280978039-528710165-233981602-1000\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
4128	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-22_f85f04a156004082d7a354a544c45daa_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
4880	PING.EXE
4128	cmd.exe
932	PING.EXE
5668	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
932	PING.EXE
5668	PING.EXE
4880	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1052 wrote to memory of 2588	1052	2026-10-22_f85f04a156004082d7a354a544c45daa_elex_wannacry.exe	89
PID 2588 wrote to memory of 4128	2588	WINWORD.exe	90
PID 4128 wrote to memory of 932	4128	cmd.exe	92
PID 4128 wrote to memory of 5668	4128	cmd.exe	93
PID 4128 wrote to memory of 4880	4128	cmd.exe	94
PID 4128 wrote to memory of 6132	4128	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-22_f85f04a156004082d7a354a544c45daa_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_f85f04a156004082d7a354a544c45daa_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1052
- 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:2588
- - 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\0000794D" 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:4128
  - - 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:932
  - - 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:5668
  - - 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:4880
  - - 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:6132

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

0000794D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000794D
Size 42KB
SHA256 3b80b2ab6660c0b878e8edf51a7d1d0a4ad576f84ac486b3d4ecfa0b89f3f974
MD5 01b661491ad98d5a3582e91930399685
SHA1 1d1cd23a4181bfa3e93e5f47395f0c4bc1087ad2
SHA512 d3278f35ecae1511c7d172f8192489fb0478e3f570d5cd9c15eb818baf77612ade4e09760a0fa3aebcd20538563de60744bfb3b10c33688037912e7da1fd2f61
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41N:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+6
TLSH
T15213171776A460D2CDB76074E91A4E30437E9DF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 a3c5c4227b31d2e8ebc4e5bc716e4f7da8ccff0bb62c1fd2bdbc745af050c486
MD5 f85f04a156004082d7a354a544c45daa
SHA1 b1c99ace10aa59ba4906d05a9c2f1aa83faadf78
SHA512 5fd4d929aaf9890248bf731e017b96e695a8af833789a44d61eec45d623a73d4fc3cb9d7d0679b3512c42a37eaff08597cc2c942ce6b4325fbb18d764978b7f0
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41z:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+Y
TLSH
T11413171776A460D2CDB76074E91A5E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads