juko | a9ff040aefa0fb005a2bc6c46b806737937592c82d04f53842e2292e925135a0

General

Target
2026-08-06_fdf0cf40654903d8e7a7608c7109fd3b_elex_wannacry.exe
Size 87KB
Sample260806-kyd89assbt
SHA256 a9ff040aefa0fb005a2bc6c46b806737937592c82d04f53842e2292e925135a0
MD5 fdf0cf40654903d8e7a7608c7109fd3b
SHA1 6b349ca231df025fc1dbb40198c136f8f7e5e115
SHA512 f77a4fa76c37a8ded6f158933880ede052adc797e5a0363f550bc1a3a24b4a6f5de570e7350af950de49ad3b63fbabcb2df08cabf5547a2ff4b9337c469208a3
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpv:2Ly2Kerc64CiGIm1K851YO6EQkwpv
TLSH
T17B93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/4544-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000700000001b867-5.dat	family_juko
behavioral2/memory/4544-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4100-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c549-13.dat	family_juko
behavioral2/memory/5760-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5760-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4100	WINWORD.exe
5760	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-1-5-21-3986082593-3624157295-3514260330-1000\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
4580	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	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	2026-08-06_fdf0cf40654903d8e7a7608c7109fd3b_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
4580	cmd.exe
6096	PING.EXE
1968	PING.EXE
2032	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6096	PING.EXE
1968	PING.EXE
2032	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4544 wrote to memory of 4100	4544	2026-08-06_fdf0cf40654903d8e7a7608c7109fd3b_elex_wannacry.exe	89
PID 4100 wrote to memory of 4580	4100	WINWORD.exe	90
PID 4580 wrote to memory of 6096	4580	cmd.exe	92
PID 4580 wrote to memory of 1968	4580	cmd.exe	93
PID 4580 wrote to memory of 2032	4580	cmd.exe	94
PID 4580 wrote to memory of 5760	4580	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-06_fdf0cf40654903d8e7a7608c7109fd3b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-06_fdf0cf40654903d8e7a7608c7109fd3b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4544
- 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:4100
- - 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\0000153E" 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:4580
  - - 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:6096
  - - 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:1968
  - - 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:2032
  - - 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:5760

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

0000153E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000153E
Size 87KB
SHA256 58011c390c2414f0e85e02655e93564856340e38006beb551161b6ad237b4969
MD5 664b4a6ec4cf8a2b5eedaebb32ccd63f
SHA1 caddcddf07acdbd088d85236af2b8f40e5062616
SHA512 9ba9116e74dc9d754eb25e90949875d2baa2e371953c003b9f9ced8cdcebabf234ca0a39502e6afbfe1016e0b9e8a38c9b94d58610a73f37a1b8cbc90b1065ed
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpk:2Ly2Kerc64CiGIm1K851YO6EQkwpk
TLSH
T16A93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 a9ff040aefa0fb005a2bc6c46b806737937592c82d04f53842e2292e925135a0
MD5 fdf0cf40654903d8e7a7608c7109fd3b
SHA1 6b349ca231df025fc1dbb40198c136f8f7e5e115
SHA512 f77a4fa76c37a8ded6f158933880ede052adc797e5a0363f550bc1a3a24b4a6f5de570e7350af950de49ad3b63fbabcb2df08cabf5547a2ff4b9337c469208a3
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpv:2Ly2Kerc64CiGIm1K851YO6EQkwpv
TLSH
T17B93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4100-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4544-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4544-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5760-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5760-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads