Office (OLE) / .XLS malware analysis — malicious · f8569a28afa07907

MALICIOUS

Office (OLE) / .XLS

146.5 KB Created: 2023-04-11 19:19:23 Authoring application: Microsoft Excel First seen: 2023-04-11

MD5: cb7929cf1abc35c3360f0c675995a551 SHA-1: fb773340fe210e3693b4b339696d9b849d4ed4e6 SHA-256: f8569a28afa079072bf1faf79e715dda7513e382dc423fc5ee07ec2f54223d24

328 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical heuristic OLE_VBA_DOWNLOAD and the presence of a Workbook_Open macro indicate that this XLS file is designed to download and execute a secondary payload. The VBA code explicitly uses the URLDownloadToFileA API, suggesting an attempt to fetch and run malicious content from a remote source. The ClamAV detection further confirms its malicious nature.

Heuristics 8

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.
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` `eaec68b731b9f64857b8292723770880a079ec909cb4e00650021c8894fe98c4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	41594 bytes

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