Office (OLE) / .XLS malware analysis — malicious · 41b972caddc035b2

MALICIOUS

Office (OLE) / .XLS

75.5 KB Created: 2023-08-21 14:53:50 Authoring application: Microsoft Excel First seen: 2023-08-22

MD5: 8345f5f832ccc46e0907d1554e7d6d34 SHA-1: c3b48bfe714a7f4c51bbf07afab3e46aefcdf7dd SHA-256: 41b972caddc035b290530a4d91da5570be040bb02ce9ba7f9cd648f9f936562e

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059 Command and Scripting Interpreter T1140 Deobfuscate/Decode Files or Information

The sample is an Excel file containing VBA macros, specifically a Workbook_Open macro that executes a shell command. The macro utilizes the URLDownloadToFile API, indicating it is designed to download and execute a second-stage payload. The document body contains a lure to enable macros, presenting a fake SWIFT notification.

Heuristics 9

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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` `7697296e8a23e9835349660ac82deacc5f1047855d44ee784bb8da28717a948f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	9931 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.