Office (OLE) / .XLS malware analysis — malicious · c2f39ccb743f8122

MALICIOUS

Office (OLE) / .XLS

126.0 KB Created: 2022-10-12 00:01:23 Authoring application: Microsoft Excel First seen: 2022-10-12

MD5: 50079e9d0aa5353c8eca8fc3a0b2637c SHA-1: e7f185ea583d8a74621e4ffe37ded86ce27302cc SHA-256: c2f39ccb743f8122448c5e7fea2319fbb4da4718e4f54dce5d5ad5367c93338a

260 Risk Score

Malware Insights

MITRE ATT&CK

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

This XLS file contains VBA macros, including AutoOpen and Auto_Open, which are designed to execute automatically when the document is opened. The critical heuristic 'OLE_VBA_SHELL' indicates the use of the Shell() function, a common method for launching external processes. While the script is truncated and obfuscated, the presence of these auto-execution macros and the Shell() call strongly suggests the intent to download and execute a secondary payload, characteristic of many malware droppers.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Xls.Malware.Valyria-10029786-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10029786-0
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
Auto_Open macro high OLE_VBA_AUTO

Auto_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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `324a0816f0c3fcdd39861b1111823dae957d0174168066bd99b60ad96ec63035`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	23022 bytes

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