Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 27a37ee06eac83fc…

MALICIOUS

Office (OLE) / .XLS

49.0 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel
MD5: 82056bcc854d502478005768eb35a77f SHA-1: 0e481611d68ff85daeda31b4569ec1a2f357a666 SHA-256: 27a37ee06eac83fc3bb6895273c89e4b3b33938ef00195b40896d3633520f7cd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1059.005 Visual Basic

The Workbook_Open macro is configured to execute a PowerShell command. This command is constructed by concatenating strings and is designed to download a second-stage executable from 'http://18.209.1.250/22/QPL-51000302711.exe' and save it as 'C:\Users\Public\Documents\concernmeet.exe'. The macro also writes this command to a file named 'C:\Users\Public\apersone.czmd' before executing it via ShellExecuteW. The use of ShellExecuteW and the download/execution pattern strongly indicate a downloader functionality.

Heuristics 5

  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8fba679e3c8c737456c394e6ceed8edb405dd3307cc9f990d45cf1ada4846329
vba-macro oletools.olevba.extract_macros (decoded VBA source) 1882 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).