Office (OOXML) / .XLSM malware analysis — malicious · 406b2b65751ecb3c

MALICIOUS

Office (OOXML) / .XLSM

46.1 KB Created: 2022-05-17 08:06:58 UTC Authoring application: 16.0300 First seen: 2022-05-17

MD5: 6bbcc8a832ec6f17c283cee3e1095270 SHA-1: a7906a38de96863057638317a4a82bf55767f5d5 SHA-256: 406b2b65751ecb3c25cc8a66d6fff3cde74ee35df84612981f6dd056fad16cd5

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is an XLSM file containing VBA macros. The critical heuristic 'OLE_VBA_DOWNLOAD' and the presence of the 'URLDownloadToFileA' function in the 'macros.bas' script indicate that the macro attempts to download a file from a remote location. The script also uses 'Shell()' to execute a downloaded payload, as indicated by the 'OLE_VBA_SHELL' heuristic. The reconstructed command 'regsvr32 /s ' is used to execute the downloaded payload.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Suspicious extracted artifact medium 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `29bc5c24ddb276281c5ae2039af4b8a9814a2e7db6bca0f5844d67e3a16b3824`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1922 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`vbaProject_00.bin` `2dd93a82528cb12438295990f73c43802f7cf4066ed1aad75ab5dd9b8fb82812`	vba-project	OOXML VBA project: xl/vbaProject.bin	25600 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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