juko | 23955e817db0b01f6e33a0f81099be0b1efe5f0e93601df1448df873dfb40bc7

General

Target
2026-08-01_ffffa322a7089a81f4b4e8665f74684d_elex_wannacry.exe
Size 48KB
Sample260802-eccweateph
SHA256 23955e817db0b01f6e33a0f81099be0b1efe5f0e93601df1448df873dfb40bc7
MD5 ffffa322a7089a81f4b4e8665f74684d
SHA1 a7ffc2d30263d8479744a8644430d2ece95834f6
SHA512 1dd6e4e43f087247e8690eb96c743d98b5a2673c540637886aadf0881d9509174e9526f090dcaa12cdeae0385e2840a51c82d1d57d45f840653df3224e61630b
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8k:bLy2Kerc64CiGImav42j08
TLSH
T1C4234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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 7 IoCs

resource	yara_rule
behavioral2/memory/2448-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000a000000011374-5.dat	family_juko
behavioral2/memory/2448-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4692-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c423-13.dat	family_juko
behavioral2/memory/2664-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2664-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4692	WINWORD.exe
2664	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-1-5-21-2115213192-531537726-3295841909-1000\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
4316	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_ffffa322a7089a81f4b4e8665f74684d_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

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
4316	cmd.exe
2080	PING.EXE
1652	PING.EXE
4644	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2080	PING.EXE
1652	PING.EXE
4644	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2448 wrote to memory of 4692	2448	2026-08-01_ffffa322a7089a81f4b4e8665f74684d_elex_wannacry.exe	89
PID 4692 wrote to memory of 4316	4692	WINWORD.exe	90
PID 4316 wrote to memory of 2080	4316	cmd.exe	92
PID 4316 wrote to memory of 1652	4316	cmd.exe	93
PID 4316 wrote to memory of 4644	4316	cmd.exe	94
PID 4316 wrote to memory of 2664	4316	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_ffffa322a7089a81f4b4e8665f74684d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_ffffa322a7089a81f4b4e8665f74684d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2448
- 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:4692
- - 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\00001746" 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:4316
  - - 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:2080
  - - 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:1652
  - - 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:4644
  - - 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:2664

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

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Downloads

00001746

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001746
Size 48KB
SHA256 44423db5cb7ca6eaf54deb7cf3dd7809cbc2bbd59a7f2ab5ade9c85d16b56072
MD5 558c2c25c4e9a9503abdc41d510064b4
SHA1 21883b031cec7ecdfe022a713eb60ad37029ac28
SHA512 722de8911ef1d5472720c34c2fdb90a719a216a78796781fca1a28a1518d7868042b0d874e03f2f9073d4f81960ce904487fb5b70e34be611587233964d9eb8f
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8L:bLy2Kerc64CiGImav42j0j
TLSH
T1C4234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 23955e817db0b01f6e33a0f81099be0b1efe5f0e93601df1448df873dfb40bc7
MD5 ffffa322a7089a81f4b4e8665f74684d
SHA1 a7ffc2d30263d8479744a8644430d2ece95834f6
SHA512 1dd6e4e43f087247e8690eb96c743d98b5a2673c540637886aadf0881d9509174e9526f090dcaa12cdeae0385e2840a51c82d1d57d45f840653df3224e61630b
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8k:bLy2Kerc64CiGImav42j08
TLSH
T1C4234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2448-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2448-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2664-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2664-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4692-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads