Office (OLE) / .XLSX malware analysis — malicious · 2cac4b53e6b09491

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel

MD5: 7e048e44fce4506f812f384e539be6cb SHA-1: 198e081d2796b6da8e1cbdc650e056f78e17b2ea SHA-256: 2cac4b53e6b094917d8d770e94e9dcc4f013bc36678ed703d0d0929e522f16c0

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a macro-enabled Excel file that triggers a Workbook_Open event. This event executes VBA code which uses CreateObject to call Windows command shell functions. The script attempts to download and execute a VBS file from a hardcoded URL, specifically 'http://midnighitsilvercrafters.com/store/wBjNOUwc/BI710N4cA6R3/', and a batch file from 'http://tempra.com/NAT_E_05_22_2009/BI710N4cA6R3/'. The script also attempts to create a scheduled task or similar execution mechanism using the downloaded files. The ClamAV detection name 'Doc.Downloader.EmotetRed02220-9938909-0' further supports its role as a downloader.

Heuristics 6

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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` `1c4e61c3a5649eba808b953523dbc6097c47180fc24d811adc11b724b307ac52`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	52433 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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