juko | 71cb5a893f19a7784316b125239c28dcf7640bb602688a63aee309de231cdb5c

General

Target
2026-06-28_4e723c46cf9a144d25cb1529bcdd2bb7_elex_wannacry.exe
Size 49KB
Sample260628-2np2fafx8y
SHA256 71cb5a893f19a7784316b125239c28dcf7640bb602688a63aee309de231cdb5c
MD5 4e723c46cf9a144d25cb1529bcdd2bb7
SHA1 26434c594f7e773160cb190bbe81188e6f79a0ef
SHA512 7b1de714c653224cdd93cd9ded244d592aefe30c14249e541a565fdc79965768b9de6e3b7046cc20b7629ea1a41f317bf236f9610ca640f5e2e26d413e6df5a9
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2Q:VLy2Kerc64CiGImVucp4kojWh2Q
TLSH
T10C334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/1464-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x00080000000007f2-5.dat	family_juko
behavioral2/memory/1464-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5816-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0005000000016b45-13.dat	family_juko
behavioral2/memory/5924-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5924-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5816	WINWORD.exe
5924	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-1-5-21-28459746-3881314244-166055492-1000\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

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	2026-06-28_4e723c46cf9a144d25cb1529bcdd2bb7_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
2692	PING.EXE
824	PING.EXE
4028	cmd.exe
2880	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
824	PING.EXE
2880	PING.EXE
2692	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1464 wrote to memory of 5816	1464	2026-06-28_4e723c46cf9a144d25cb1529bcdd2bb7_elex_wannacry.exe	89
PID 5816 wrote to memory of 4028	5816	WINWORD.exe	90
PID 4028 wrote to memory of 2880	4028	cmd.exe	92
PID 4028 wrote to memory of 2692	4028	cmd.exe	93
PID 4028 wrote to memory of 824	4028	cmd.exe	94
PID 4028 wrote to memory of 5924	4028	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-06-28_4e723c46cf9a144d25cb1529bcdd2bb7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-28_4e723c46cf9a144d25cb1529bcdd2bb7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1464
- 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:5816
- - 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\00001CFB" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4028
  - - 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:2880
  - - 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:2692
  - - 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:824
  - - 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:5924

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00001CFB

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001CFB
Size 49KB
SHA256 c1093f8628cd5e25edced60e806d13e3bf5c7cabbbf07267a88fd988a3c0cb14
MD5 62e328e3c6eec06368c64b4009c02e36
SHA1 6b3cfd2e0351889994fe686cb89e6fe23f21adc0
SHA512 c18d7689dafafeb5d533fc9fff4f1bfdea95e921df835f5992958923964ae394fecf16cd21cf67e4f70d19e457f2acada14a96775e0741f79e6989e455b249a0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2l:VLy2Kerc64CiGImVucp4kojWh2l
TLSH
T14A334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 71cb5a893f19a7784316b125239c28dcf7640bb602688a63aee309de231cdb5c
MD5 4e723c46cf9a144d25cb1529bcdd2bb7
SHA1 26434c594f7e773160cb190bbe81188e6f79a0ef
SHA512 7b1de714c653224cdd93cd9ded244d592aefe30c14249e541a565fdc79965768b9de6e3b7046cc20b7629ea1a41f317bf236f9610ca640f5e2e26d413e6df5a9
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2Q:VLy2Kerc64CiGImVucp4kojWh2Q
TLSH
T10C334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1464-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1464-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5816-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5924-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5924-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads