Office (OOXML) / .XLSM malware analysis — malicious · 4adb7b4c9675a7ee

MALICIOUS

Office (OOXML) / .XLSM

439.3 KB Created: 2021-07-28 10:37:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: b53ae6ed9169808d303ae13d072b28c0 SHA-1: 5697952ec3d6ae149924475b2505e99817988bea SHA-256: 4adb7b4c9675a7ee62ada5f154ac353228fc578f321ebe616dc0a40fb38b1022

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLSM file containing a Workbook_Open macro that executes a payload. The macro reconstructs a registry path for persistence: HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy. It then uses CreateObject to execute a command, likely downloading and running a second-stage payload from the constructed path.

Heuristics 5

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` `76c4868fb6f9ff6069f1324d717d8c0129c9ccd4b36f9821817484210a2484f8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1133 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` `b21ad0bff73d15e664aac1a999d022dfa533dae8cf2408d22a258ce2a957799c`	vba-project	OOXML VBA project: xl/vbaProject.bin	9216 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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