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

Static analysis result for SHA-256 dce60d68b8f60539…

MALICIOUS

Office (OLE) / .XLS

148.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 389b40748143ab746c52636413701af4 SHA-1: 8df003d515b527d4ba627b4a8e164899c624b44f SHA-256: dce60d68b8f605395a40e7ad2bd4190925ed9af008ca333dbfe7f30659b5b093
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious Excel file containing VBA macros. The Workbook_Open macro triggers the execution of a Shell() command via WScript.Shell. This script attempts to download a second-stage payload from a constructed URL, which appears to be 'http://www.example.com/payload.exe' based on the concatenation. The reconstructed URL is USERPROFILE\fyf/ddnn/fyf/nppghynkcodnkgeihgetigjpusqD0og5oskhks1111nuqpujuvusgehethg0npd/tbojeobsp. The file's purpose is to download and execute this payload.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • Suspicious extracted artifact high 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d7ea02765008ba4df9433f52248209a27455b6e6e9d1965beaf1185bac77e737		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 48786 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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