juko | 9ef04e2ae96aa94e0456c17f815bc7af4092c75d6e0c550366c1361f70df3905

General

Target
2026-10-21_951f036212a2c9f42b371e04bb9350fe_elex_wannacry.exe
Size 88KB
Sample261022-vbprksv16n
SHA256 9ef04e2ae96aa94e0456c17f815bc7af4092c75d6e0c550366c1361f70df3905
MD5 951f036212a2c9f42b371e04bb9350fe
SHA1 3799fc1b4c87b8f350c809ab217ea60086b889b1
SHA512 5ce3c6879b08fad73f0db68eafec8d393505584af6b14e6dd0bcdf73c1ad93f0aa03d3d757f9ca9753e600c380fea50dca5726a5941037aa7e2e306c5be589fd
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsu:sLy2Kerc64CiGIm8so28wzCBlycJWee5
TLSH
T130933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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/0x000c00000001b2cb-3.dat	family_juko
behavioral2/files/0x000e00000001c4ee-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5640	WINWORD.exe
2772	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
248	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	2026-10-21_951f036212a2c9f42b371e04bb9350fe_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
248	cmd.exe
240	PING.EXE
272	PING.EXE
6128	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
240	PING.EXE
272	PING.EXE
6128	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4948 wrote to memory of 5640	4948	2026-10-21_951f036212a2c9f42b371e04bb9350fe_elex_wannacry.exe	89
PID 5640 wrote to memory of 248	5640	WINWORD.exe	90
PID 248 wrote to memory of 240	248	cmd.exe	92
PID 248 wrote to memory of 272	248	cmd.exe	93
PID 248 wrote to memory of 6128	248	cmd.exe	94
PID 248 wrote to memory of 2772	248	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-21_951f036212a2c9f42b371e04bb9350fe_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-21_951f036212a2c9f42b371e04bb9350fe_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4948
- 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:5640
- - 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\00001C1A" 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:248
  - - 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:240
  - - 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:272
  - - 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:6128
  - - 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:2772

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

00001C1A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001C1A
Size 88KB
SHA256 015d456b2e67345fb507ef5b313c930ee09a553bf57ac34b11f47d13a70323e0
MD5 1c167cddbbd948e6d76ad4a63ca005bb
SHA1 2c1cb66194482b9ae52a709e821e0837cb0b0004
SHA512 cb317d32e6092225c279cb307f3e843a852caef57aac9f44fe0370737382c1368ed429f5a968d5089612242dd4125f0fa9f77c5a136a675260fe7961c535f863
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsJ:sLy2Kerc64CiGIm8so28wzCBlycJWeeu
TLSH
T13D933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 9ef04e2ae96aa94e0456c17f815bc7af4092c75d6e0c550366c1361f70df3905
MD5 951f036212a2c9f42b371e04bb9350fe
SHA1 3799fc1b4c87b8f350c809ab217ea60086b889b1
SHA512 5ce3c6879b08fad73f0db68eafec8d393505584af6b14e6dd0bcdf73c1ad93f0aa03d3d757f9ca9753e600c380fea50dca5726a5941037aa7e2e306c5be589fd
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsu:sLy2Kerc64CiGIm8so28wzCBlycJWee5
TLSH
T130933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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