juko | fa7b7e1bfe902af93451a0a69575e0de85e66228c2f7c84bb989c7590e24276c

General

Target
2026-08-04_a5e966100a3a1251ee7d8350c9af11bf_elex_wannacry.exe
Size 48KB
Sample260804-gp226sxtcw
SHA256 fa7b7e1bfe902af93451a0a69575e0de85e66228c2f7c84bb989c7590e24276c
MD5 a5e966100a3a1251ee7d8350c9af11bf
SHA1 fc822749334c3c7d3d5e1e1159c03a9735b98f12
SHA512 284d29895a2e2a426c412c02cc6bf45cc918b01cd18b3c8a3995a7ff4dd6de4ab50152210d5034f221fcdfbcbd0e9bedf0078c411560418d5f9538107ac38726
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8N:bLy2Kerc64CiGImav42j0V
TLSH
T1BA234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/1916-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000019cc9-5.dat	family_juko
behavioral2/memory/1916-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4144-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c52a-13.dat	family_juko
behavioral2/memory/1196-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1196-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4144	WINWORD.exe
1196	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-1-5-21-1738198120-2966725515-3980530802-1000\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
4108	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	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	2026-08-04_a5e966100a3a1251ee7d8350c9af11bf_elex_wannacry.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
4108	cmd.exe
1532	PING.EXE
3120	PING.EXE
4620	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3120	PING.EXE
4620	PING.EXE
1532	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1916 wrote to memory of 4144	1916	2026-08-04_a5e966100a3a1251ee7d8350c9af11bf_elex_wannacry.exe	89
PID 4144 wrote to memory of 4108	4144	WINWORD.exe	90
PID 4108 wrote to memory of 1532	4108	cmd.exe	92
PID 4108 wrote to memory of 3120	4108	cmd.exe	93
PID 4108 wrote to memory of 4620	4108	cmd.exe	94
PID 4108 wrote to memory of 1196	4108	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_a5e966100a3a1251ee7d8350c9af11bf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_a5e966100a3a1251ee7d8350c9af11bf_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1916
- 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:4144
- - 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\00001A46" 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:4108
  - - 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:1532
  - - 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:3120
  - - 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:4620
  - - 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:1196

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

00001A46

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001A46
Size 48KB
SHA256 b69e7d32c9ec90b72d142c55d9f50cbd9f06f6df09d244b325aa024d6552281a
MD5 3edb13f12146d9127057f05c98356238
SHA1 20d52120bcc3387e330cc8e2d929597c60908467
SHA512 2b7b4c7f38f516f0e10c2167e20c23d30ce16c62b5f4b88d2840974bbf513ea86f5dc28cd3ca5722268bee2f15cf2d197d5d8209a2969e3146bddfe6460a8997
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8f:bLy2Kerc64CiGImav42j03
TLSH
T13B234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 fa7b7e1bfe902af93451a0a69575e0de85e66228c2f7c84bb989c7590e24276c
MD5 a5e966100a3a1251ee7d8350c9af11bf
SHA1 fc822749334c3c7d3d5e1e1159c03a9735b98f12
SHA512 284d29895a2e2a426c412c02cc6bf45cc918b01cd18b3c8a3995a7ff4dd6de4ab50152210d5034f221fcdfbcbd0e9bedf0078c411560418d5f9538107ac38726
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8N:bLy2Kerc64CiGImav42j0V
TLSH
T1BA234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1196-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1196-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1916-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1916-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4144-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads