Office (OLE) / .XLS malware analysis — malicious · 35eabe9993c9b53c

MALICIOUS

Office (OLE) / .XLS

82.0 KB Created: 2025-06-06 18:33:19 Authoring application: Microsoft Excel

MD5: e857427326fd363dfca42fdf53167e0f SHA-1: da791b584aae4e9e758d0f0017a6a10ce87ba998 SHA-256: 35eabe9993c9b53c23015aadaba9ba235700833c3abb7838cf57d3dcaa755d2b

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 when the workbook is opened. This macro utilizes the URLDownloadToFile API, indicating an intent to download and execute a second-stage payload from a remote source. The presence of ShellExecute and the p-code auto-execution further support the malicious nature of this macro-based downloader.

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` `cb2bc3a21c58abbba5ee04068bb602e554e794bce51a39409adfe7acf0f4ca39`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	5716 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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