Office (OLE) / .XLS malware analysis — malicious · 417b21104c212d3c

MALICIOUS

Office (OLE) / .XLS

84.0 KB Created: 2023-03-26 18:39:30 Authoring application: Microsoft Excel First seen: 2023-03-27

MD5: 870113986bdda1aa22c44ededf987447 SHA-1: 0ad93b69557f0e2b13d9e72f10939527c464196b SHA-256: 417b21104c212d3c6443c30960b43bfa3c65dda72061a5a2c0246ff97930eb18

328 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical heuristic OLE_VBA_DOWNLOAD and the presence of a Workbook_Open macro indicate that the sample is designed to download and execute a secondary payload. The VBA code explicitly uses URLDownloadToFileA from urlmon.dll, suggesting an attempt to fetch and run malicious content from a remote source. The ShellExecuteA function from shell32.dll is also referenced, likely for executing the downloaded payload.

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` `05f45999820686727ddee8ef47bd76548e53ea55cceaba1b2e78b637f731dfa1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	29432 bytes

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