Office (OLE) / .XLS malware analysis — malicious · 8ab1f75580a67baf

MALICIOUS

Office (OLE) / .XLS

144.5 KB Created: 2022-10-10 05:24:19 Authoring application: Microsoft Excel First seen: 2022-10-10

MD5: 5ed9dc08ff9847d0559f1bcd0665fa99 SHA-1: acd766133e3f29abf8e450df63c04fcb40405ad7 SHA-256: 8ab1f75580a67bafa1866c71787864c366f73ee9ec34540c9ab370f6a5b0ddaa

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. The critical heuristic 'OLE_VBA_SHELL' indicates a Shell() call within the VBA code, which is commonly used to download and execute further malicious content. The presence of AutoOpen and Auto_Open subroutines further suggests automatic execution upon opening the document. The ClamAV detection name 'Xls.Malware.Valyria-10029786-0' also confirms 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` `8b3a96a3570fc77869ece1dafa1ac96f16e8318b518e6f544da3e04706b8e04b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22553 bytes

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