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

Static analysis result for SHA-256 87ed434fb928130b…

MALICIOUS

Office (OLE) / .XLS

1.65 MB Created: 2016-04-08 13:33:00 Authoring application: Microsoft Excel
MD5: f5e388029d30e099e7e84cc9417fcc5e SHA-1: 7fda222a44dd7fcb4e3af4d03b69276ba5d76fed SHA-256: 87ed434fb928130b44855d655030292aeefd14225534e6da58a6d42fa948b065
420 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an Excel file containing a Workbook_Open macro that uses WScript.Shell and CreateObject to execute arbitrary code. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions to enable macros to decrypt a password-protected archive, a common tactic to bypass security filters. The embedded URL http://www.frez.co.uk is likely used to download a second-stage payload.

Heuristics 11

  • 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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.frez.co.uk

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7c3c5a602d3540894503ce4391518b7e7b2ca1e67a4dda92362a6b8aa3a76fb1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1499882 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 shell/COM execution token(s). Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 62 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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