Office (OOXML) malware analysis — malicious · 06c8eee579b1246d

MALICIOUS

Office (OOXML)

19.4 KB Created: 2021-07-29 14:08:44 UTC Authoring application: Microsoft Excel 16.0300

MD5: ed9b7376ca01004f0182fecc07bc976c SHA-1: 89063a1d295205ff7dabe3907a5eb4fa58c2cdbd SHA-256: 06c8eee579b1246d3ffe97ea63a2adeb9e8b3d376e3c344a359b314da135d9f5

322 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file contains a Workbook_Open macro that triggers obfuscated VBA code. This code utilizes WScript.Shell and CreateObject to execute commands, strongly suggesting it attempts to download and run a secondary payload. The obfuscation and use of auto-execution routines are common in macro-based malware delivery.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
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.
VBA project inside OOXML medium OOXML_VBA

Document contains a VBA project — VBA macros present
Suspicious extracted artifact info 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `e6da56acd1feb4e540d5ef2ac141f2af8ba8e65bb1703ebc743779ebdf4c3bc8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7832 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 long base64-like blob(s).
`vbaProject_00.bin` `76a7d4496926d3fd7cbd0ce39f4ed8327f098a97f08c4f1cfe27626ea45864ea`	vba-project	OOXML VBA project: xl/vbaProject.bin	26624 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 long base64-like blob(s).

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