Office (OLE) / .XLS malware analysis — malicious · 2a905086ac3cd417

MALICIOUS

Office (OLE) / .XLS

66.5 KB Created: 2023-09-11 00:30:47 Authoring application: Microsoft Excel First seen: 2023-09-13

MD5: 95b510e35c448752b0f5f43c05df37c5 SHA-1: 10fdc2a076545fe9074de044ef0009e96571ea81 SHA-256: 2a905086ac3cd417480ee05327903baa184d4ddcb59a9500cb16c2c7689a1523

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Xls.Malware.Sagent-10008079-0. High-severity heuristics indicate the presence of a Workbook_Open VBA macro that uses CreateObject and GetObject calls, suggesting it's designed to execute code upon opening. The VBA macro is heavily obfuscated, but its structure and the presence of auto-execution tokens strongly suggest it's intended to download and run a secondary payload.

Heuristics 6

ClamAV: Xls.Malware.Sagent-10008079-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Sagent-10008079-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject call
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `dd8daf01ed7e6b09e82380527236b435105a54daa84290b943d98f014cb91020`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4233 bytes

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