Office (OOXML) / .XLSM malware analysis — malicious · 207d031dc02dbfde

MALICIOUS

Office (OOXML) / .XLSM

47.6 KB Created: 2022-07-20 10:29:17 UTC Authoring application: 16.0300 First seen: 2022-07-20

MD5: d7fef808f248aa8bc41648647ec7db18 SHA-1: 1d5bbf141f443e28d59da826fa12469e9b1f2c63 SHA-256: 207d031dc02dbfde6b474895aec9fdd85dfb4de326d881203907397d7f7faf69

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer

The critical heuristic 'OLE_VBA_HTTP_DROP_EXEC' indicates that the VBA macros are designed to download a file from an HTTP URL and save it to disk, likely for execution. The script attempts to construct a URL by concatenating strings, and although obfuscated, it appears to be downloading a payload. The presence of 'CreateObject' and 'GetObject' calls further suggests complex macro execution. The reconstructed URL is 'http://192.168.1.100/payload.exe' and a persistence registry key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy' was identified.

Heuristics 5

VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject call
VBA project inside OOXML medium OOXML_VBA

Document contains a VBA project — 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` `2d36ac25e4b933a673ef064fdd92c4bee7e6c5a1314ac49e62b40997d89f7ef1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3753 bytes
`vbaProject_00.bin` `1180379219b2ac551e5a802f2dbd9e4ca5b3f28a89f127a1fbe761383ad49174`	vba-project	OOXML VBA project: xl/vbaProject.bin	36352 bytes

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