juko | 968828af9c2fb162abaee0fa490d780e2d438894ec6ab262d8b46bcd6d47fb38

General

Target
2026-08-15_18107fe6162b071bd62fda05f9e5d03d_elex_wannacry.exe
Size 88KB
Sample260815-prwl6swfrd
SHA256 968828af9c2fb162abaee0fa490d780e2d438894ec6ab262d8b46bcd6d47fb38
MD5 18107fe6162b071bd62fda05f9e5d03d
SHA1 7d20c4c8185d80a1f2f83163cc68eb31129dc9f5
SHA512 59a470b720e8274e60f4af5614fb09ee20c11d8442c37205665868117296421611ddc6fac658f733ca1851401bb92bffb09e8cb851f9278396978c99ed3d1cea
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrX:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193P
TLSH
T191934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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/0x00130000000118f0-4.dat	family_juko
behavioral2/files/0x000e00000001c5c3-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4384	WINWORD.exe
6832	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-1-5-21-1014449518-1831897916-4205727055-1000\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
1824	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	2026-08-15_18107fe6162b071bd62fda05f9e5d03d_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
4432	PING.EXE
1824	cmd.exe
6792	PING.EXE
4764	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6792	PING.EXE
4764	PING.EXE
4432	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4088 wrote to memory of 4384	4088	2026-08-15_18107fe6162b071bd62fda05f9e5d03d_elex_wannacry.exe	90
PID 4384 wrote to memory of 1824	4384	WINWORD.exe	91
PID 1824 wrote to memory of 6792	1824	cmd.exe	93
PID 1824 wrote to memory of 4764	1824	cmd.exe	94
PID 1824 wrote to memory of 4432	1824	cmd.exe	95
PID 1824 wrote to memory of 6832	1824	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-15_18107fe6162b071bd62fda05f9e5d03d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-15_18107fe6162b071bd62fda05f9e5d03d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4088
- 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:4384
- - 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\00007919" 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:1824
  - - 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:6792
  - - 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:4764
  - - 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:4432
  - - 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:6832

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

00007919

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007919
Size 88KB
SHA256 bb2557b8394507e9dcaef3107b180b5c926c81406a523255daa2cef468964348
MD5 0487e82639bbbeb02b56df730aee47e1
SHA1 19fddf4be90d25ab91f40b3e10ab38550aa2563d
SHA512 28cce2b78c7b2c2da4a283a4256b2da33a8251adcd0769113e045bade63b08ae4ddffb7a9ee21847e4ea1111d1c6faa0cab022ece0f19b47ec2ceb24345b18d6
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrv:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193H
TLSH
T18F934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 968828af9c2fb162abaee0fa490d780e2d438894ec6ab262d8b46bcd6d47fb38
MD5 18107fe6162b071bd62fda05f9e5d03d
SHA1 7d20c4c8185d80a1f2f83163cc68eb31129dc9f5
SHA512 59a470b720e8274e60f4af5614fb09ee20c11d8442c37205665868117296421611ddc6fac658f733ca1851401bb92bffb09e8cb851f9278396978c99ed3d1cea
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrX:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193P
TLSH
T191934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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