Office (OLE) / .XLS malware analysis — malicious · 78538080ae6128c4

MALICIOUS

Office (OLE) / .XLS

144.0 KB Created: 2023-04-11 11:58:13 Authoring application: Microsoft Excel First seen: 2023-04-11

MD5: daee3043c0f75c0f4c59998167fce612 SHA-1: e5da20f955d46925557de0d295d08ddf6b02bb2e SHA-256: 78538080ae6128c4f51709f34d35aad392dcfcf294f8f464ca396cec0898ccef

328 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The file contains VBA macros, including a Workbook_Open event, which is a common technique for automatic execution upon opening. The macros utilize ShellExecuteA and URLDownloadToFileA APIs, indicating an intent to download and execute a secondary payload from a remote source. The ClamAV detection as 'Xls.Malware.Valyria-10028013-0' further supports 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` `d20ebb272f942aa7c7afa3171e6b4e7e96f6ac345abed8026993b60c0381e640`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	21432 bytes

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