Office (OOXML) / .XLSM malware analysis — malicious · 4a5330baad4ea3e5

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 33d2f17cce9a8794ae43c7641552d41a SHA-1: 423317d408ad935884ba7956f855443e504fb46d SHA-256: 4a5330baad4ea3e50958775fa8b0caca54fcc133dd1dd4f623e29019b24c160d

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an XLSM file containing a Workbook_Open macro. This macro reconstructs a registry path, 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy', and uses CreateObject to execute a command. The command appears to be constructed from environment variables and cell values, likely leading to the download and execution of a second-stage payload. The macro's obfuscated nature and use of CreateObject suggest a downloader or initial access mechanism.

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` `74bcd5735597c42074aa5f81c0834cf205542f6124fd63f6a7ba7b726e2c945d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1177 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` `7890a40499a1a7754f9368c79806d7c3704da71fc5e973b8b6794e52159d1cd9`	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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