juko | af285202dae541062e3db86bb3704dca1bcd0f037056c56cfe0595cd92e7ebac

General

Target
2026-10-19_862c4dbe8f3d1a3c5dc36126969f7ff8_elex_wannacry.exe
Size 37KB
Sample261020-rr89da117q
SHA256 af285202dae541062e3db86bb3704dca1bcd0f037056c56cfe0595cd92e7ebac
MD5 862c4dbe8f3d1a3c5dc36126969f7ff8
SHA1 18e8eb3323a95b5dd94dc06ac338aece1ce46ba6
SHA512 6e9da21ff3f6cdc803e4d87620e399e0d887eb2da94640148a12c52f227cbad808697251655221ed299927898eab9e783b01f471e7b532866833c8dd556c1213
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa0:3LsF2Kerc64sTiX2IV0DhuogwD
TLSH
T1AB035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/5732-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000019cb3-4.dat	family_juko
behavioral2/memory/5732-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1160-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0006000000000442-13.dat	family_juko
behavioral2/memory/3060-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3060-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1160	WINWORD.exe
3060	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-1-5-21-53044966-3830981193-2402648431-1000\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
4344	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-19_862c4dbe8f3d1a3c5dc36126969f7ff8_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

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
4344	cmd.exe
4748	PING.EXE
2696	PING.EXE
3156	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4748	PING.EXE
2696	PING.EXE
3156	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5732 wrote to memory of 1160	5732	2026-10-19_862c4dbe8f3d1a3c5dc36126969f7ff8_elex_wannacry.exe	89
PID 1160 wrote to memory of 4344	1160	WINWORD.exe	90
PID 4344 wrote to memory of 4748	4344	cmd.exe	92
PID 4344 wrote to memory of 2696	4344	cmd.exe	93
PID 4344 wrote to memory of 3156	4344	cmd.exe	94
PID 4344 wrote to memory of 3060	4344	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-19_862c4dbe8f3d1a3c5dc36126969f7ff8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-19_862c4dbe8f3d1a3c5dc36126969f7ff8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5732
- 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:1160
- - 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\00004A06" 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:4344
  - - 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:4748
  - - 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:2696
  - - 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:3156
  - - 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:3060

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

00004A06

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004A06
Size 37KB
SHA256 05dc3877fff4451fd92fa14835e6289c394d3626bffaae47d277a77b2d27c5a3
MD5 3fc72ef66a1c603fb299fba42cb6c573
SHA1 2fc488528d5391ae24ad6306c828556139747024
SHA512 c6509cab8cfc716e30039a16da461665161215adeb8baf014f968456f2cdc04d8a3e92efe78d75a43c7fdafe53b9561fe2ee631f47ed31fde87e46d58766dae6
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywam:3LsF2Kerc64sTiX2IV0DhuogwV
TLSH
T1FE035C1A299160A2D55310B0E9D82FB4C53D8C76106BB066F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 af285202dae541062e3db86bb3704dca1bcd0f037056c56cfe0595cd92e7ebac
MD5 862c4dbe8f3d1a3c5dc36126969f7ff8
SHA1 18e8eb3323a95b5dd94dc06ac338aece1ce46ba6
SHA512 6e9da21ff3f6cdc803e4d87620e399e0d887eb2da94640148a12c52f227cbad808697251655221ed299927898eab9e783b01f471e7b532866833c8dd556c1213
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa0:3LsF2Kerc64sTiX2IV0DhuogwD
TLSH
T1AB035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1160-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3060-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3060-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5732-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5732-9-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads