juko | a864df1a299038f96aeb1f68275eaef45b979c7c2f0b18f4a0a755a70ff13093

General

Target
2026-11-06_cf0f4b10821e40321125f3e5d965dbe3_elex_wannacry.exe
Size 32KB
Sample261107-2vtcfagv4k
SHA256 a864df1a299038f96aeb1f68275eaef45b979c7c2f0b18f4a0a755a70ff13093
MD5 cf0f4b10821e40321125f3e5d965dbe3
SHA1 f3bf33b4652e77461bf242efc0c51d9a8f89fa64
SHA512 6d92b084fe1ba1d48a8c79ea8376b9344cc25c7af53412d66cbacdfc794baf44a0ef59c2bd78c369a5a7cbfd6dffbcdc5629d89da50034438918824de33d334e
SSDEEP 768:zZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQH2mm:dLsF2Kerc64sTiX2IV0DOTmm
TLSH
T1FBE23A2B6AA17052C59720F0F9592F34C43D9DB9016BB0A2F7417B6928B2D63CF719CE
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/0x000600000000053e-3.dat	family_juko
behavioral2/files/0x0007000000016b3a-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2256	WINWORD.exe
5688	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-1-5-21-4154726816-2055034831-2297277433-1000\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
4612	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-06_cf0f4b10821e40321125f3e5d965dbe3_elex_wannacry.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
2288	PING.EXE
1296	PING.EXE
4612	cmd.exe
3044	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3044	PING.EXE
2288	PING.EXE
1296	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4688 wrote to memory of 2256	4688	2026-11-06_cf0f4b10821e40321125f3e5d965dbe3_elex_wannacry.exe	89
PID 2256 wrote to memory of 4612	2256	WINWORD.exe	90
PID 4612 wrote to memory of 3044	4612	cmd.exe	92
PID 4612 wrote to memory of 2288	4612	cmd.exe	93
PID 4612 wrote to memory of 1296	4612	cmd.exe	94
PID 4612 wrote to memory of 5688	4612	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-11-06_cf0f4b10821e40321125f3e5d965dbe3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-06_cf0f4b10821e40321125f3e5d965dbe3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4688
- 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:2256
- - 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\00004BC7" 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:4612
  - - 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:3044
  - - 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:2288
  - - 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:1296
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:5688

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00004BC7

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004BC7
Size 32KB
SHA256 5743407dbc7740509149a9fb43a6d820712e0cffe57910261aa3ebe09f1c46a0
MD5 a1f6719915e3f183f3921cb0dcc20fcd
SHA1 46c0b4fd4604927ade6109eadd75392b5b91ba10
SHA512 33ff131cfb000249ad968c06ba782d1493d9711e0d3fca33ad3cbeae888a7e09cc1134a0cbba3a4d55fd2849879c9cc957ac8f57ed05552136197c20d65e8f0b
SSDEEP 768:zZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQH2mT:dLsF2Kerc64sTiX2IV0DOTmT
TLSH
T102E23A2B6AA17052C59720F0F9592F34C43D9DB9016BB0A2F7417B6928B2D63CF719CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 a864df1a299038f96aeb1f68275eaef45b979c7c2f0b18f4a0a755a70ff13093
MD5 cf0f4b10821e40321125f3e5d965dbe3
SHA1 f3bf33b4652e77461bf242efc0c51d9a8f89fa64
SHA512 6d92b084fe1ba1d48a8c79ea8376b9344cc25c7af53412d66cbacdfc794baf44a0ef59c2bd78c369a5a7cbfd6dffbcdc5629d89da50034438918824de33d334e
SSDEEP 768:zZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQH2mm:dLsF2Kerc64sTiX2IV0DOTmm
TLSH
T1FBE23A2B6AA17052C59720F0F9592F34C43D9DB9016BB0A2F7417B6928B2D63CF719CE
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