Office (OLE) / .XLS malware analysis — malicious · 6e494eb76d75ee02

MALICIOUS

Office (OLE) / .XLS

50.0 KB Created: 2023-02-07 13:56:39 First seen: 2023-02-08

MD5: dfa81020430c1ef567f78d42cee9fc7b SHA-1: 23e7f48b5591cd529801574afbd420eef4221e89 SHA-256: 6e494eb76d75ee02b28e370ab667bcbcdc6f5143ad522090f4b8244eb472d447

188 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains VBA macros that utilize CreateObject to instantiate MSXML2.XMLHTTP and ADODB.Stream objects. The script attempts to download a file from the hardcoded URL '2ht40t1p11s4:6/12/b5bp0li78ne3.c4o0m4', save it to a temporary file, and then execute it using the Shell() function. This indicates a downloader or droppper functionality.

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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