Office (OOXML) / .XLSM malware analysis — malicious · e0392ad74655e1b7

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 40590ad7aab0023ded81628b82b351cd SHA-1: 953f2adb991a8b8227982ccd045ad5e387249dcf SHA-256: e0392ad74655e1b7462044c9c3aea30f9148d18f536b8c106570a39969ec4364

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, indicating an attempt to execute code upon opening. The macro uses CreateObject to execute a command, which appears to be constructing a path to a file for execution. The script reconstructs the path 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy' which is likely used for persistence. The Environ() call and cell references suggest dynamic construction of the payload path, but the primary intent is to execute a downloaded or staged payload.

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` `150f4032c76eba235cac90858b07f4c1f9aa5692af85a06d39ab6f6c2878c562`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1147 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` `091817e87cbb367f2243ff052dfd54dc2c02e2766cd448972351b87c30787e71`	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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