juko | 8d54aba3da4f87289f83f7d88ddac65c57511d09a0dd549a02179da0c2ff5bbe

General

Target
2026-06-02_0120af3a0109b973f0d818020e176d84_elex_wannacry.exe
Size 88KB
Sample260602-ap2cbahx9x
SHA256 8d54aba3da4f87289f83f7d88ddac65c57511d09a0dd549a02179da0c2ff5bbe
MD5 0120af3a0109b973f0d818020e176d84
SHA1 28b4d8e3527bcfb6b2ad0580343234152026e174
SHA512 50eb7d02a9b0511c31732f28da6485333169c698865f79b06bd314eea30cfc7fd9eec295df7173191ea37468af96d3b74168ab6e1b6e3b7c5fd2fcf1d2b99826
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrB:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193J
TLSH
T1A7934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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 2 IoCs

resource	yara_rule
behavioral2/files/0x002b00000002b306-4.dat	family_juko
behavioral2/files/0x001b00000002b523-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
808	WINWORD.exe
3544	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-1-5-21-2824035265-2271499813-2042964211-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-06-02_0120af3a0109b973f0d818020e176d84_elex_wannacry.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
4056	cmd.exe
3760	PING.EXE
2600	PING.EXE
4920	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3760	PING.EXE
2600	PING.EXE
4920	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1704 wrote to memory of 808	1704	2026-06-02_0120af3a0109b973f0d818020e176d84_elex_wannacry.exe	81
PID 808 wrote to memory of 4056	808	WINWORD.exe	82
PID 4056 wrote to memory of 3760	4056	cmd.exe	84
PID 4056 wrote to memory of 2600	4056	cmd.exe	85
PID 4056 wrote to memory of 4920	4056	cmd.exe	86
PID 4056 wrote to memory of 3544	4056	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-06-02_0120af3a0109b973f0d818020e176d84_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-02_0120af3a0109b973f0d818020e176d84_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1704
- 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:808
- - 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\0000570D" 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:4056
  - - 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:3760
  - - 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:2600
  - - 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:4920
  - - 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:3544

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

0000570D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000570D
Size 88KB
SHA256 d2c957c377106e8f75114e5bdc80bd819d1ca60135a349dcc662b7a02b04964f
MD5 85d86c3f37a9ec9af3fccbfdf4c028da
SHA1 4e832fdcb4885ecc4d377380621cafcdada9da35
SHA512 7e46c30803dd43201f65b788be94a9d3a49c1a8a3f7689eee9324c29f07c8d43993c3a26e5ff216efea45bd0a841505876564cbd57e8b258a35e16da8c382454
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrJ:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193x
TLSH
T171934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 8d54aba3da4f87289f83f7d88ddac65c57511d09a0dd549a02179da0c2ff5bbe
MD5 0120af3a0109b973f0d818020e176d84
SHA1 28b4d8e3527bcfb6b2ad0580343234152026e174
SHA512 50eb7d02a9b0511c31732f28da6485333169c698865f79b06bd314eea30cfc7fd9eec295df7173191ea37468af96d3b74168ab6e1b6e3b7c5fd2fcf1d2b99826
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrB:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193J
TLSH
T1A7934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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