Office (OLE) / .XLS malware analysis — malicious · aa0c23ff57c89091

MALICIOUS

Office (OLE) / .XLS

410.0 KB Created: 2021-05-06 17:52:50 Authoring application: Microsoft Excel

MD5: 6a7bd45c84373b00086d7c0ecab1ffcd SHA-1: ad3328cafb1fd86491f76705f2b5c9cb80394bc9 SHA-256: aa0c23ff57c890910a1ba814b727ab5512b55ff7785d975ed634bc6824d4502e

308 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The file contains VBA macros, specifically a Workbook_Open macro, which is designed to execute automatically. This macro references the URLDownloadToFile API, indicating its intent to download a second-stage payload from a remote source. The presence of ShellExecute API calls further suggests the execution of downloaded content. The document body is minimal, providing no additional context beyond sheet names.

Heuristics 8

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
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.
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.

Filename	Kind	Source	Size
`macros.bas` `becd0fef7347467bdbfd5b8b66d1fa4ca69a0f9beec7807c75c7ed6236a5d80e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	264021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 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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