juko | 7aa7c35f978752cf31ec18491e94329ab3d00e7a63fcc33f8531644003d06811

General

Target
2026-08-04_3fbed4c692faad8ddb9835cb41b7d08d_elex_wannacry.exe
Size 153KB
Sample260804-jezv6sfc97
SHA256 7aa7c35f978752cf31ec18491e94329ab3d00e7a63fcc33f8531644003d06811
MD5 3fbed4c692faad8ddb9835cb41b7d08d
SHA1 c9d9386ba249161df7dddc1fc2ed1470d4c7b378
SHA512 fc51d83787c0a26be8b95262189ef347fc3f3ab2f7a671eb4d4bfa70beb7daa28445c7d2503e6fb6f340744749c51d563a22293f859842a2a00e35cd55f956f5
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gy:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZQ
TLSH
T17AE35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
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/4324-0-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x000700000001b714-5.dat	family_juko
behavioral2/memory/4324-9-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/3032-12-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x001000000001c402-13.dat	family_juko
behavioral2/memory/1548-15-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/1548-16-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3032	WINWORD.exe
1548	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
4788	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	2026-08-04_3fbed4c692faad8ddb9835cb41b7d08d_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
3900	PING.EXE
3596	PING.EXE
4788	cmd.exe
2856	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2856	PING.EXE
3900	PING.EXE
3596	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4324 wrote to memory of 3032	4324	2026-08-04_3fbed4c692faad8ddb9835cb41b7d08d_elex_wannacry.exe	89
PID 3032 wrote to memory of 4788	3032	WINWORD.exe	90
PID 4788 wrote to memory of 2856	4788	cmd.exe	92
PID 4788 wrote to memory of 3900	4788	cmd.exe	93
PID 4788 wrote to memory of 3596	4788	cmd.exe	94
PID 4788 wrote to memory of 1548	4788	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_3fbed4c692faad8ddb9835cb41b7d08d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_3fbed4c692faad8ddb9835cb41b7d08d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4324
- 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:3032
- - 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\00006341" 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:4788
  - - 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:2856
  - - 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:3900
  - - 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:3596
  - - 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:1548

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

00006341

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006341
Size 153KB
SHA256 12224ddbed22a55dac1b3ac684833e39fa4de8c9f7d2034cc8d0c7defbfbd21e
MD5 37e4d6a33075fd4d97351608db12bc0e
SHA1 074611177642c28d9a14abdfb36bdddb28291a97
SHA512 e1d30a73c581e96987bdc01d761086585d34df3cfd3b7d209c0cb7b0b7489d476ac652fbee85eb28af3086e4676be1a9fcb181830b7c05cbece906b78c2e63ea
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gL:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZR
TLSH
T1D2E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 153KB
SHA256 7aa7c35f978752cf31ec18491e94329ab3d00e7a63fcc33f8531644003d06811
MD5 3fbed4c692faad8ddb9835cb41b7d08d
SHA1 c9d9386ba249161df7dddc1fc2ed1470d4c7b378
SHA512 fc51d83787c0a26be8b95262189ef347fc3f3ab2f7a671eb4d4bfa70beb7daa28445c7d2503e6fb6f340744749c51d563a22293f859842a2a00e35cd55f956f5
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gy:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZQ
TLSH
T17AE35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1548-15-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/1548-16-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/3032-12-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/4324-0-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/4324-9-0x0000000000400000-0x000000000043B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads