juko | 46aa7be4e3030ca2fb7d0cebdc0da90eaf24927496ca9644a312e881aa3874c8

General

Target
2026-08-17_6290692946e66df8992c0ece86171684_elex_wannacry.exe
Size 37KB
Sample260817-tabb5acc77
SHA256 46aa7be4e3030ca2fb7d0cebdc0da90eaf24927496ca9644a312e881aa3874c8
MD5 6290692946e66df8992c0ece86171684
SHA1 667ab98b5aafbc8650cf30cd8dc477df2213ba97
SHA512 4a3b4da4ba34753aed6bec456e0b9f6439e387ec62709efbffde51f47e1790d80a9150e6820e6684c8b3c4c18ad070f3a9dda5c3f41fb6a267bdf2625eb64715
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywak:3LsF2Kerc64sTiX2IV0Dhuogw7
TLSH
T1D5035C1A299160A2D55310B0E9D82FB4C53D8C76146BB062F740BE59A8B3CD7DF72BCE
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
behavioral1/memory/4600-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0008000000024682-5.dat	family_juko
behavioral1/memory/4600-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2256-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0009000000024683-15.dat	family_juko
behavioral1/memory/1904-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1904-18-0x0000000000400000-0x000000000041D000-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-08-17_6290692946e66df8992c0ece86171684_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2256	WINWORD.exe
1904	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-1-5-21-668679576-120646659-2289335452-1000\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
4328	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	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	2026-08-17_6290692946e66df8992c0ece86171684_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
4328	cmd.exe
1612	PING.EXE
1684	PING.EXE
4108	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4108	PING.EXE
1612	PING.EXE
1684	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4600 wrote to memory of 2256	4600	2026-08-17_6290692946e66df8992c0ece86171684_elex_wannacry.exe	87
PID 2256 wrote to memory of 4328	2256	WINWORD.exe	89
PID 4328 wrote to memory of 1612	4328	cmd.exe	91
PID 4328 wrote to memory of 1684	4328	cmd.exe	92
PID 4328 wrote to memory of 4108	4328	cmd.exe	93
PID 4328 wrote to memory of 1904	4328	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-17_6290692946e66df8992c0ece86171684_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-17_6290692946e66df8992c0ece86171684_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4600
- 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: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\0000665E" 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:4328
  - - 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:1612
  - - 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:1684
  - - 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:4108
  - - 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:1904

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000665E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000665E
Size 37KB
SHA256 9f0c8349ae009a500e80e61664ac5f5092147fb52e79af9d99565045bc0a3001
MD5 5162a1e8efed9b7de0ee521a8fd0e813
SHA1 4d23a4cb15d71f46d4259fa61f1d238eb14645b6
SHA512 8daf11672944754862bb9f19975b0753c263939269b04829e6014ce4efd61d35a900f7f322fa8722317bd4575f29c07a7bdb61eb27fd5f188999c0944ce3632e
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa+:3LsF2Kerc64sTiX2IV0Dhuogwd
TLSH
T118035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 46aa7be4e3030ca2fb7d0cebdc0da90eaf24927496ca9644a312e881aa3874c8
MD5 6290692946e66df8992c0ece86171684
SHA1 667ab98b5aafbc8650cf30cd8dc477df2213ba97
SHA512 4a3b4da4ba34753aed6bec456e0b9f6439e387ec62709efbffde51f47e1790d80a9150e6820e6684c8b3c4c18ad070f3a9dda5c3f41fb6a267bdf2625eb64715
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywak:3LsF2Kerc64sTiX2IV0Dhuogw7
TLSH
T1D5035C1A299160A2D55310B0E9D82FB4C53D8C76146BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1904-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1904-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2256-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4600-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4600-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads