juko | ec9d8444cf706c9c2438f6062d5b42c3db92713513df2772d314716dbc434e0e

General

Target
2026-08-01_34b852eb9f7f73231e47cdcc017fd988_elex_wannacry.exe
Size 53KB
Sample260801-rexpta1vax
SHA256 ec9d8444cf706c9c2438f6062d5b42c3db92713513df2772d314716dbc434e0e
MD5 34b852eb9f7f73231e47cdcc017fd988
SHA1 243cd99e7fbbf73d6e49c2a5939ac2d8df5918e1
SHA512 de6f54a56ce1c79f25161966a44bbb50b34deaeb4d7a47f22ff9fc6fb49a1182cb2ead5c509719b99624ba7f75bc57041b99e5f777511ada5452d4223f9d778e
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2l:3Ly2Kerc64CiGIm1tcBMUOOFl
TLSH
T18E335B176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x000900000001b871-4.dat	family_juko
behavioral2/files/0x000f00000001c563-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3228	WINWORD.exe
2640	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-1-5-21-1738198120-2966725515-3980530802-1000\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
5380	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_34b852eb9f7f73231e47cdcc017fd988_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

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
3844	PING.EXE
3068	PING.EXE
5380	cmd.exe
2536	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2536	PING.EXE
3844	PING.EXE
3068	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 3228	4836	2026-08-01_34b852eb9f7f73231e47cdcc017fd988_elex_wannacry.exe	88
PID 3228 wrote to memory of 5380	3228	WINWORD.exe	89
PID 5380 wrote to memory of 2536	5380	cmd.exe	91
PID 5380 wrote to memory of 3844	5380	cmd.exe	92
PID 5380 wrote to memory of 3068	5380	cmd.exe	93
PID 5380 wrote to memory of 2640	5380	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-01_34b852eb9f7f73231e47cdcc017fd988_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_34b852eb9f7f73231e47cdcc017fd988_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4836
- 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:3228
- - 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\00005975" 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:5380
  - - 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:2536
  - - 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:3844
  - - 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:3068
  - - 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:2640

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

00005975

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005975
Size 53KB
SHA256 9bccb0734e6bbaba34cfd2d455cea8e7aed76cae63640667d3142d0b1ea08b51
MD5 3248f17285b38c87487f4edc7c52da3d
SHA1 06468ce5af98688936423793384fc1cd3486da0c
SHA512 ea800fa9a8b1644edfadb9d160d6ef2accd0091a0080326ca34d71ec213b5761dd90b58e708a923e5e2492aed50ce475662359b6b06cbce314691eb5d65aa286
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq20:3Ly2Kerc64CiGIm1tcBMUOOF0
TLSH
T119335B176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 ec9d8444cf706c9c2438f6062d5b42c3db92713513df2772d314716dbc434e0e
MD5 34b852eb9f7f73231e47cdcc017fd988
SHA1 243cd99e7fbbf73d6e49c2a5939ac2d8df5918e1
SHA512 de6f54a56ce1c79f25161966a44bbb50b34deaeb4d7a47f22ff9fc6fb49a1182cb2ead5c509719b99624ba7f75bc57041b99e5f777511ada5452d4223f9d778e
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2l:3Ly2Kerc64CiGIm1tcBMUOOFl
TLSH
T18E335B176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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