juko | 497a648fb0d9c1390e7472bc077cf736ecb949dec36ded38638035c30596dec0

General

Target
2026-07-16_d8b39bf5f4ac3c821398b02a7d1de577_elex_wannacry.exe
Size 87KB
Sample260716-c69fcsbv9k
SHA256 497a648fb0d9c1390e7472bc077cf736ecb949dec36ded38638035c30596dec0
MD5 d8b39bf5f4ac3c821398b02a7d1de577
SHA1 75a3395cccce2a9a112aa5e857fa1fd6891967d9
SHA512 79734f9e22002d3d0527098353fcae92bb74321d16f9db58d09cfb89446c2aa9d74af17566acffe77d1dd0d9251c0e6fa3c6627bace912a116ff7e282d931053
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpn:2Ly2Kerc64CiGIm1K851YO6EQkwpn
TLSH
T1CB93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/5944-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000a000000011380-5.dat	family_juko
behavioral2/memory/5944-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2768-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c445-13.dat	family_juko
behavioral2/memory/4328-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4328-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2768	WINWORD.exe
4328	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-1-5-21-2246396966-3025826688-3847171515-1000\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	2026-07-16_d8b39bf5f4ac3c821398b02a7d1de577_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
3760	cmd.exe
2984	PING.EXE
5736	PING.EXE
1432	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2984	PING.EXE
5736	PING.EXE
1432	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5944 wrote to memory of 2768	5944	2026-07-16_d8b39bf5f4ac3c821398b02a7d1de577_elex_wannacry.exe	88
PID 2768 wrote to memory of 3760	2768	WINWORD.exe	89
PID 3760 wrote to memory of 2984	3760	cmd.exe	91
PID 3760 wrote to memory of 5736	3760	cmd.exe	92
PID 3760 wrote to memory of 1432	3760	cmd.exe	93
PID 3760 wrote to memory of 4328	3760	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-16_d8b39bf5f4ac3c821398b02a7d1de577_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-16_d8b39bf5f4ac3c821398b02a7d1de577_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5944
- 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:2768
- - 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\00005581" 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: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:2984
  - - 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:5736
  - - 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:1432
  - - 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:4328

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

00005581

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005581
Size 87KB
SHA256 be206660b75dd3e79d133078e4e8c65d78510bf05742abf54369c8af9f361566
MD5 852bd0fb63e654f8666c93de99a90b73
SHA1 7fd985d0221418c50202bcc9fc3646efac3aa7a5
SHA512 5b3bd17992752664bce3920e2ad277e0d713cebc4f51beb3aab1846b7ee8bd28d78af7265f15ee2505dcc11260611fc5c4d95e5dfd48f00f1cfc2da88eae8ea3
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpe:2Ly2Kerc64CiGIm1K851YO6EQkwpe
TLSH
T14C93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 497a648fb0d9c1390e7472bc077cf736ecb949dec36ded38638035c30596dec0
MD5 d8b39bf5f4ac3c821398b02a7d1de577
SHA1 75a3395cccce2a9a112aa5e857fa1fd6891967d9
SHA512 79734f9e22002d3d0527098353fcae92bb74321d16f9db58d09cfb89446c2aa9d74af17566acffe77d1dd0d9251c0e6fa3c6627bace912a116ff7e282d931053
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpn:2Ly2Kerc64CiGIm1K851YO6EQkwpn
TLSH
T1CB93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2768-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4328-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4328-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5944-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5944-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads