Office (OOXML) / .XLSM malware analysis — malicious · b4efe49e96c10da9

MALICIOUS

Office (OOXML) / .XLSM

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300

MD5: 09a5170e2fee485b0ebae4ee16935756 SHA-1: ba6bc44eb287f384f2eca8c40a1cc8fa1e5f11ab SHA-256: b4efe49e96c10da9e00820cba8e15fb7276d7ffa72627b67fbd070c3639d5602

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an XLSM file containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. The macro references cmd.exe and PowerShell, and uses WMI to launch a process. This indicates the macro is designed to download and execute a second-stage payload. The Base64 decoding function suggests obfuscation of the payload or its download URL.

Heuristics 7

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE

VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject call
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `18d70a3d3775dfcc368715c5291eeab62c4517833f32fa8291687ca096126184`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `e031a45a40546cf6e51af6888a68ac680fd1324d06bde727758d0db0517e96d1`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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