juko | db4a82be2e8f2d0899b97f121a89e0cf196231a66a1ae18f06f78d1c4dac7bc9

General

Target
2026-08-31_25f126898d50695d2d5e666cd0908ef5_elex_wannacry.exe
Size 48KB
Sample260831-11cffaae59
SHA256 db4a82be2e8f2d0899b97f121a89e0cf196231a66a1ae18f06f78d1c4dac7bc9
MD5 25f126898d50695d2d5e666cd0908ef5
SHA1 d9572406228a67a8c37a100eaa0be8b07372467d
SHA512 100a9a2764977a360b5a2a920e2cef21ddf7ee636b3d41809641f161a60950ae3e2f358c9dfe37e69cda038c3575f6cc1c560a5a0a0239e83d93418000eb3c9c
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8s:bLy2Kerc64CiGImav42j0E
TLSH
T103234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/2036-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0007000000016b3a-5.dat	family_juko
behavioral2/memory/2036-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2056-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000700000001b8b6-13.dat	family_juko
behavioral2/memory/5408-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5408-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2056	WINWORD.exe
5408	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-1-5-21-3797332335-34111092-3597280141-1000\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
4232	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	2026-08-31_25f126898d50695d2d5e666cd0908ef5_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
252	PING.EXE
4612	PING.EXE
4232	cmd.exe
4884	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4884	PING.EXE
252	PING.EXE
4612	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2036 wrote to memory of 2056	2036	2026-08-31_25f126898d50695d2d5e666cd0908ef5_elex_wannacry.exe	90
PID 2056 wrote to memory of 4232	2056	WINWORD.exe	91
PID 4232 wrote to memory of 4884	4232	cmd.exe	93
PID 4232 wrote to memory of 252	4232	cmd.exe	94
PID 4232 wrote to memory of 4612	4232	cmd.exe	95
PID 4232 wrote to memory of 5408	4232	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-31_25f126898d50695d2d5e666cd0908ef5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_25f126898d50695d2d5e666cd0908ef5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2036
- 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:2056
- - 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\000033A8" 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:4232
  - - 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:4884
  - - 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:252
  - - 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:4612
  - - 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:5408

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

000033A8

Path C:\Users\Admin\AppData\Roaming\Mozilla\000033A8
Size 48KB
SHA256 d92a187cb05869db7bfb04f93d980a24e8a1dde2e299512fe1a3d8d1f1cb33dc
MD5 6a4d2e02d571e81c67d64edcac144845
SHA1 d298cc1d3a93a866d29c6886ad30b729a778d35e
SHA512 72a941ec97dd8423797668577836ea1e065cef73cfc9f907cf3857fd92fd0035b2165bfb2ac34057a54885b6d1e39df43b3480626b66a3585d828cc8645cbf60
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8p:bLy2Kerc64CiGImav42j0B
TLSH
T18A234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 db4a82be2e8f2d0899b97f121a89e0cf196231a66a1ae18f06f78d1c4dac7bc9
MD5 25f126898d50695d2d5e666cd0908ef5
SHA1 d9572406228a67a8c37a100eaa0be8b07372467d
SHA512 100a9a2764977a360b5a2a920e2cef21ddf7ee636b3d41809641f161a60950ae3e2f358c9dfe37e69cda038c3575f6cc1c560a5a0a0239e83d93418000eb3c9c
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8s:bLy2Kerc64CiGImav42j0E
TLSH
T103234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2036-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2036-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2056-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5408-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5408-16-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads