Office (OOXML) / .XLSM malware analysis — malicious · 2760275310e436cc

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 17f0ec2a04751445cdc99c98eb90d489 SHA-1: f5592d425fdcdb3115370d76937fc900dd483125 SHA-256: 2760275310e436cc247d35ea9323439e5add3a3f6e24b2984e0db7b27f5d6ad0

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The sample is an XLSM file containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. The macro reconstructs a command string by concatenating values from environment variables and cells, specifically targeting `cmd.exe /c "C:\Users\Public\IAccessible2Proxy.exe"`. This command is executed via `CreateObject`, indicating an attempt to download and run a second-stage payload. The macro also writes a string to a file named `IAccessible2Proxy.exe` in the `C:\Users\Public\` directory. The use of `Environ()` and cell values suggests obfuscation to hide the true nature of the 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` `97e704dfab9b70b8b32ac000cc42b4954ca821e22d27f030841a09689c8e054a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1137 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` `4014334994632607588397342a858b7d9c443388ea280f5784d9143b8d07510e`	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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