Office (OLE) / .XLS malware analysis — malicious · e65e81cc7ccdf656

MALICIOUS

Office (OLE) / .XLS

123.5 KB Created: 2023-01-27 20:12:23 Authoring application: Microsoft Excel First seen: 2023-01-27

MD5: afe4170d77abff8b7161e1cd825f6cd9 SHA-1: d476c3649bed87677be656208c3c92bce4fe1fdd SHA-256: e65e81cc7ccdf6569a0af3aaf8e1bd0d23caa332e8d416caf393d241ca4b4c43

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 Excel file is designed to download and execute a secondary payload. The script uses ShellExecuteA and URLDownloadToFileA APIs, suggesting a downloader functionality. The ClamAV detection 'Xls.Malware.Valyria-10028013-0' 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` `d873b7d00fbcb55e2561346fe4c5d7d7c6868e8a661b54b40984c083437c3d1a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	349118 bytes

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