juko | ec12cc283e2a065a88478f373834357664a959930befae9685f3cb0476a6e921

General

Target
2026-08-09_b5b99397f6d92595e2f5554a2936c5cc_elex_wannacry.exe
Size 88KB
Sample260809-m5xqaaztf1
SHA256 ec12cc283e2a065a88478f373834357664a959930befae9685f3cb0476a6e921
MD5 b5b99397f6d92595e2f5554a2936c5cc
SHA1 6ece283ffbc4d1a7f782fca80078bb6b75c1ade2
SHA512 f72e8327e585249a76336766683e3476b1284e74bc7776c7998b6592160c7f5acccec6ef3b5be30669cca5a7d6cadc9666556deef18a26c9bb645227a04704b1
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrd:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193l
TLSH
T19F934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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/0x000c000000016cdf-4.dat	family_juko
behavioral2/files/0x000e00000001c4e5-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2788	WINWORD.exe
832	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-1-5-21-552508041-2681165170-3229858294-1000\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
3380	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	2026-08-09_b5b99397f6d92595e2f5554a2936c5cc_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
3104	PING.EXE
6032	PING.EXE
1640	PING.EXE
3380	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3104	PING.EXE
6032	PING.EXE
1640	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2480 wrote to memory of 2788	2480	2026-08-09_b5b99397f6d92595e2f5554a2936c5cc_elex_wannacry.exe	89
PID 2788 wrote to memory of 3380	2788	WINWORD.exe	90
PID 3380 wrote to memory of 3104	3380	cmd.exe	92
PID 3380 wrote to memory of 6032	3380	cmd.exe	93
PID 3380 wrote to memory of 1640	3380	cmd.exe	94
PID 3380 wrote to memory of 832	3380	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_b5b99397f6d92595e2f5554a2936c5cc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_b5b99397f6d92595e2f5554a2936c5cc_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2480
- 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:2788
- - 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\00000029" 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:3380
  - - 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:3104
  - - 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:6032
  - - 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:1640
  - - 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:832

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

Replay Monitor

Loading Replay Monitor...

Downloads

00000029

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000029
Size 88KB
SHA256 9ba7320a2b4ed0c091bd14e390ccbcb9d5e3b27b21bc8d0967c0ac630ef52f47
MD5 77ded3ea25d0b809aa8d5f1e82beec50
SHA1 6d581b6748f5ce0f4c0c191f55704bb39d3316bb
SHA512 24f555eecaa33ca919ee9f603000e41efd59c590fae622d547a26c042768beaf20845c5a5d7a152122f2a5f13ddbcbb73480ec72ef28f6d213f1bc09bdb63053
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrU:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193s
TLSH
T15E934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 ec12cc283e2a065a88478f373834357664a959930befae9685f3cb0476a6e921
MD5 b5b99397f6d92595e2f5554a2936c5cc
SHA1 6ece283ffbc4d1a7f782fca80078bb6b75c1ade2
SHA512 f72e8327e585249a76336766683e3476b1284e74bc7776c7998b6592160c7f5acccec6ef3b5be30669cca5a7d6cadc9666556deef18a26c9bb645227a04704b1
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrd:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193l
TLSH
T19F934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads