Office (OLE) / .XLS malware analysis — malicious · f053c1c3a7299cfb

MALICIOUS

Office (OLE) / .XLS

235.5 KB Created: 2024-07-02 07:58:27 Authoring application: Microsoft Excel

MD5: 0e12304e5c5fe813567d9e9ba7d07b5d SHA-1: ee152e454910a6f4ea43d797ecd5e1ba7fcfbfba SHA-256: f053c1c3a7299cfb9e36e14f90d538a3cf8fb119c8126bfa25400506d4e4f00a

368 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel spreadsheet containing VBA macros. The Workbook_Open macro is configured to execute, and heuristics indicate it uses ShellExecute and URLDownloadToFile. This suggests the macro is designed to download and run a secondary payload from a remote source. The presence of 'macros.bas' further confirms the macro content.

Heuristics 9

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
ClamAV: Xls.Malware.Valyria-10028013-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10028013-0
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` `1558fcb4b5e05dcf28af2b89f8e7bf7089713a83618f72e51c40cbe12e674501`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	9544 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.

Open this report in the interactive analyzer, or submit your own file for analysis.