Office (OOXML) / .XLSM malware analysis — malicious · 2657a10c7ccd83fe

MALICIOUS

Office (OOXML) / .XLSM

417.3 KB Created: 2021-03-22 14:11:46 UTC Authoring application: Microsoft Excel 12.0000

MD5: e391234ad8969ee93813458c325194c4 SHA-1: cf4cbacbb5533ec90ec8215d01284d18b35dd139 SHA-256: 2657a10c7ccd83fe042c172a67c31c3a40dfff1c97cc7549533b2af8de2eb88e

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059 Command and Scripting Interpreter T1059.005 Visual Basic

The file is a macro-enabled Excel spreadsheet (XLSM) containing VBA macros. A critical heuristic indicates the presence of a Shell() call within the VBA code, and another critical heuristic flags it as ClamAV: Xls.Downloader.DridexGreen09213-9890103-0. This strongly suggests the macro is designed to execute a command, likely to download and run a second-stage payload.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Xls.Downloader.DridexGreen09213-9890103-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.DridexGreen09213-9890103-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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 project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `55049bddb5f0bd739d9500c646485b2613387bec9ea3f5a7f96a8fb3702a399a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	40459 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `ae23cc345339038b762ba50724a29285c362d15667452b9cdcc384b969206553`	vba-project	OOXML VBA project: xl/vbaProject.bin	47616 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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