Office (OLE) / .XLS malware analysis — malicious · 9f03174429e85aba

MALICIOUS

Office (OLE) / .XLS

234.0 KB Created: 2024-07-01 18:01:39 Authoring application: Microsoft Excel

MD5: 5f3ffc057fa34441689fad5260b5c93f SHA-1: e40dfb94ed877d8bf773b282c185580cd552a3ff SHA-256: 9f03174429e85aba8367f3b41fe7acba4b0c344fea47087bbd3c0c27f8213747

368 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell

The file is an Excel spreadsheet containing VBA macros. The Workbook_Open macro is configured to execute automatically upon opening the file. This macro utilizes the URLDownloadToFile API, indicating an intent to download and execute a second-stage payload from a remote location. The presence of ShellExecute and Environ() calls further suggests malicious activity, likely related to payload delivery and execution.

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` `7205472bf50ded05c96cd7a5784cda8819ad030a03d521b33ef5645d76cca8e4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	9323 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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