juko | d580c8f57a25b38efbbfc847899e96986cb152151085353ba1613ebc83a7d0bf

General

Target
2026-10-26_f9e88556bc7e230f6e26fda21f5496ae_elex_wannacry.exe
Size 37KB
Sample261027-bxveeacd65
SHA256 d580c8f57a25b38efbbfc847899e96986cb152151085353ba1613ebc83a7d0bf
MD5 f9e88556bc7e230f6e26fda21f5496ae
SHA1 04ae69de2d8db7cf74c1dfc1031a89a72cd01098
SHA512 39eab9f4bcfea5dcdfe2df01d5ea373bc8b7e6a2d8062e664a95d5042d88c701d9347ad045d7ee94bb63c9e03c3d83d7358e32fae39646c4b33867f600a83b80
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa+:3LsF2Kerc64sTiX2IV0DhuogwR
TLSH
T107035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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 8 IoCs

resource	yara_rule
behavioral1/memory/2836-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0021000000024405-4.dat	family_juko
behavioral1/memory/2836-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2164-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2164-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00080000000244b8-16.dat	family_juko
behavioral1/memory/4180-19-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4180-20-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-524788801-3318743092-4051225893-1000\Control Panel\International\Geo\Nation	2026-10-26_f9e88556bc7e230f6e26fda21f5496ae_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-524788801-3318743092-4051225893-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2164	WINWORD.exe
4180	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-1-5-21-524788801-3318743092-4051225893-1000\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
2956	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\Domain	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	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	2026-10-26_f9e88556bc7e230f6e26fda21f5496ae_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
2956	cmd.exe
1592	PING.EXE
3488	PING.EXE
3796	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1592	PING.EXE
3488	PING.EXE
3796	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2836 wrote to memory of 2164	2836	2026-10-26_f9e88556bc7e230f6e26fda21f5496ae_elex_wannacry.exe	86
PID 2164 wrote to memory of 2956	2164	WINWORD.exe	87
PID 2956 wrote to memory of 1592	2956	cmd.exe	89
PID 2956 wrote to memory of 3488	2956	cmd.exe	92
PID 2956 wrote to memory of 3796	2956	cmd.exe	95
PID 2956 wrote to memory of 4180	2956	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-26_f9e88556bc7e230f6e26fda21f5496ae_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_f9e88556bc7e230f6e26fda21f5496ae_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2836
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2164
- - 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\00001B62" 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:2956
  - - 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:1592
  - - 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:3488
  - - 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:3796
  - - 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:4180

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00001B62

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001B62
Size 37KB
SHA256 91eb6226070b81669a7d8700b41caccea0595aca7e6973f05e6f8eac7fcf5716
MD5 baf3e48c74e4ad1eacb262712b3c03c8
SHA1 3a7c3a76215a82c8123d3e4dc88d71fdb5b7790a
SHA512 6dc7221e07b28087576e2853134e8c15a89e40a81954e919f96ff58f37396a5ee1b4d072daafd417ab83d85aefacac0d17147d79cb0b145187785c195cad2970
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5yway:3LsF2Kerc64sTiX2IV0DhuogwR
TLSH
T128035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 d580c8f57a25b38efbbfc847899e96986cb152151085353ba1613ebc83a7d0bf
MD5 f9e88556bc7e230f6e26fda21f5496ae
SHA1 04ae69de2d8db7cf74c1dfc1031a89a72cd01098
SHA512 39eab9f4bcfea5dcdfe2df01d5ea373bc8b7e6a2d8062e664a95d5042d88c701d9347ad045d7ee94bb63c9e03c3d83d7358e32fae39646c4b33867f600a83b80
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa+:3LsF2Kerc64sTiX2IV0DhuogwR
TLSH
T107035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2164-13-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/2164-15-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/2836-0-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/2836-12-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4180-19-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4180-20-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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