Office (OLE) / .XLS malware analysis — malicious · 2505b1471e26a303

MALICIOUS

Office (OLE) / .XLS

50.5 KB Created: 2023-02-07 14:08:25 Authoring application: Microsoft Excel First seen: 2023-02-08

MD5: ba64d93549b14d1d81e4d8ba1068c796 SHA-1: 1a0b2ec2b000bf4acb0556f776b98d2ea45ba35d SHA-256: 2505b1471e26a303d59e5fc5f0118729a9eead489ffc6574ea2a7746e5db722d

188 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical OLE_VBA_SHELL and OLE_VBA_HTTP_DROP_EXEC heuristics indicate that the VBA macros are designed to download a file from a URL and execute it. The script reconstructs the URL '2ht40t1p11s4:6/12/b5bp0li78ne3.c4o0m4' and uses MSXML2.XMLHTTP and ADODB.Stream objects to fetch and save the payload. The subsequent Shell() call, likely using 'rundll32.exe', executes the downloaded file, confirming a downloader pattern.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
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
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f0818cbf36687a3fbf7efddcc32b476d906c0d52a95278f5a29c2780c51b721c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1987 bytes

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