juko | edf5d96519c49c0d7d99930db2295b421f38a5e4cc515f913cd302a9207399c3

General

Target
2026-08-21_f4856fc094767fd33d184e82b64b368b_elex_wannacry.exe
Size 30KB
Sample260822-aecafazakd
SHA256 edf5d96519c49c0d7d99930db2295b421f38a5e4cc515f913cd302a9207399c3
MD5 f4856fc094767fd33d184e82b64b368b
SHA1 0e2cb47d7af60ed3db9ee235464250e4136afc4f
SHA512 1da94a0e7df9817971416fda3a9257d5f410bbbf1df951924a5b902e4312bf7260eee1efd46fd270dbec6da419432fbc60a72495f628ed3f05471f79ba7a1034
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXQ:tLsF2Kerc64sTiX2IV0DzloQ
TLSH
T1F5E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000b000000016cdf-4.dat	family_juko
behavioral2/files/0x000e00000001c51a-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5552	WINWORD.exe
1512	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
3660	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	2026-08-21_f4856fc094767fd33d184e82b64b368b_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
3660	cmd.exe
5700	PING.EXE
4916	PING.EXE
4572	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5700	PING.EXE
4916	PING.EXE
4572	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2080 wrote to memory of 5552	2080	2026-08-21_f4856fc094767fd33d184e82b64b368b_elex_wannacry.exe	89
PID 5552 wrote to memory of 3660	5552	WINWORD.exe	90
PID 3660 wrote to memory of 5700	3660	cmd.exe	92
PID 3660 wrote to memory of 4916	3660	cmd.exe	93
PID 3660 wrote to memory of 4572	3660	cmd.exe	94
PID 3660 wrote to memory of 1512	3660	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-21_f4856fc094767fd33d184e82b64b368b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-21_f4856fc094767fd33d184e82b64b368b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2080
- 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:5552
- - 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\0000544E" 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:3660
  - - 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:5700
  - - 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:4916
  - - 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:4572
  - - 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:1512

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

0000544E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000544E
Size 30KB
SHA256 ee76dcfcc8853bf312e6adb82bfec355c213ee1bf74b8d8be800cc2f2a588406
MD5 0a213c62e18d97e9c87268b8f0a24cfc
SHA1 cbe398fe3b842ff1940f761b6d2d0c8c041f17b2
SHA512 94f769ebd79b658a83bbb7eea305f08adde5558d0e65600b6f1f30c4e3a1b1ad66afd271f74e36fc45a34b663205d17f194a902da9a04f32243aaec752148bcd
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX+:tLsF2Kerc64sTiX2IV0Dzlo+
TLSH
T180E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 edf5d96519c49c0d7d99930db2295b421f38a5e4cc515f913cd302a9207399c3
MD5 f4856fc094767fd33d184e82b64b368b
SHA1 0e2cb47d7af60ed3db9ee235464250e4136afc4f
SHA512 1da94a0e7df9817971416fda3a9257d5f410bbbf1df951924a5b902e4312bf7260eee1efd46fd270dbec6da419432fbc60a72495f628ed3f05471f79ba7a1034
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXQ:tLsF2Kerc64sTiX2IV0DzloQ
TLSH
T1F5E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads