juko | c841e4f24ede5a5c34e390818ded57739ebcfe7c7cbabd94a539ff8f6b5dc3c4

General

Target
2026-04-16_5bbb15624bedf022087e52ee5489ac32_elex_wannacry.exe
Size 57KB
Sample260416-qbppcsf19q
SHA256 c841e4f24ede5a5c34e390818ded57739ebcfe7c7cbabd94a539ff8f6b5dc3c4
MD5 5bbb15624bedf022087e52ee5489ac32
SHA1 96282f22c81e05f162da78163f1ed313524b8f6b
SHA512 ac2fafaf935b9cd8ca7cfd75c48c40ea7f8c8d1d9926e9a91c3526f9b7bc4aebc4a885a9155c0a0414b9cda4bb6f66ba414e725ae94b65fe915c54efb50c7045
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa2:wLy2Kerc64CiGImEsoDfa2
TLSH
T12F433913366414D1D8AB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFA83CE
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/4304-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000d00000002ad68-5.dat	family_juko
behavioral2/memory/4304-11-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/2840-14-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b403-15.dat	family_juko
behavioral2/memory/6088-17-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/6088-18-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2840	WINWORD.exe
6088	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-1-5-21-600123060-2148212387-2211176695-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-16_5bbb15624bedf022087e52ee5489ac32_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

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
4616	cmd.exe
2728	PING.EXE
3908	PING.EXE
6044	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6044	PING.EXE
2728	PING.EXE
3908	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4304 wrote to memory of 2840	4304	2026-04-16_5bbb15624bedf022087e52ee5489ac32_elex_wannacry.exe	79
PID 2840 wrote to memory of 4616	2840	WINWORD.exe	80
PID 4616 wrote to memory of 2728	4616	cmd.exe	82
PID 4616 wrote to memory of 3908	4616	cmd.exe	83
PID 4616 wrote to memory of 6044	4616	cmd.exe	84
PID 4616 wrote to memory of 6088	4616	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-16_5bbb15624bedf022087e52ee5489ac32_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-16_5bbb15624bedf022087e52ee5489ac32_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4304
- 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:2840
- - 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\000035DC" 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:4616
  - - 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:2728
  - - 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:3908
  - - 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:6044
  - - 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:6088

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

000035DC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000035DC
Size 57KB
SHA256 944e50c8fa8d398f2a18e56db1cc11a2de8e98897086fd1140e09c1c099b55d1
MD5 026ac95e1e346fef0a96bc5a756f1e9b
SHA1 756378315898e23db24df1dff81b1b03ef40a938
SHA512 f67fc5f7211f3dd21d4dc585018a19e8cac2a5b9d8b3a449993e8348e6680cd8e1fcc358ef071eb1f29cc5472a193813437bbd3024eb5add88f0251b8199d7bd
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa7:wLy2Kerc64CiGImEsoDfa7
TLSH
T193433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 c841e4f24ede5a5c34e390818ded57739ebcfe7c7cbabd94a539ff8f6b5dc3c4
MD5 5bbb15624bedf022087e52ee5489ac32
SHA1 96282f22c81e05f162da78163f1ed313524b8f6b
SHA512 ac2fafaf935b9cd8ca7cfd75c48c40ea7f8c8d1d9926e9a91c3526f9b7bc4aebc4a885a9155c0a0414b9cda4bb6f66ba414e725ae94b65fe915c54efb50c7045
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa2:wLy2Kerc64CiGImEsoDfa2
TLSH
T12F433913366414D1D8AB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFA83CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2840-14-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4304-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4304-11-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/6088-17-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/6088-18-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads