Office (OOXML) / .XLSM malware analysis — malicious · 8e574b4ae6502230

MALICIOUS

Office (OOXML) / .XLSM

18.0 KB Created: 2015-01-15 16:55:01 UTC Authoring application: Microsoft Excel 14.0300

MD5: e566fc53051035e1e6fd0ed1823de0f9 SHA-1: 00bc96c48b98676ecd67e81a6f1d7754e4156044 SHA-256: 8e574b4ae6502230c0829e2319a6c146aebd51b7008bf5bbfb731424d7952c15

388 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an XLSM document containing VBA macros, specifically a Workbook_Open macro that utilizes WScript.Shell and CreateObject to execute arbitrary commands. This indicates a dropper functionality, likely intended to download and execute a second-stage payload. The ClamAV detection further confirms its malicious nature.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
ClamAV: Xls.Dropper.Agent-7382066-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-7382066-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `8771ce04a44c5774dbe56c7596ee197e8544afd4a4820114f9d736a98491cc5a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6780 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `6ae9689658e2784b8e82bff9e5a48ea6db073ee57cb621669e83f82d89d4ad34`	vba-project	OOXML VBA project: xl/vbaProject.bin	25088 bytes
Detection ClamAV: Xls.Dropper.Agent-7382066-0 Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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