Office (OLE) / .XLS malware analysis — malicious · 376dd8bc5e36d3f3

MALICIOUS

Office (OLE) / .XLS

119.0 KB Created: 2022-10-03 05:33:28 Authoring application: Microsoft Excel First seen: 2022-10-03

MD5: 11deaf4ea6407c0e5c7ea56c41c8411b SHA-1: 16c1c48a18af5021378d5b8d21bcacb93ca0912b SHA-256: 376dd8bc5e36d3f30e525d30c1128cec6a9cdad0e45e65e0b34e79f40f413bbd

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel spreadsheet containing VBA macros, including Auto_Open and AutoOpen subroutines. These macros utilize Shell() calls and appear to be designed to execute arbitrary code, as indicated by the critical heuristic firings. The script content is heavily obfuscated and truncated, but the presence of Shell() calls strongly suggests it attempts to download and execute a second-stage payload. The ClamAV detection name 'Xls.Malware.Valyria-10029786-0' further supports its malicious nature.

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` `c62427c01ff0ddd5b6e246520b204347ea78e56667b5aaadbac58da5c4f22fa2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18189 bytes

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