Office (OLE) / .XLS malware analysis — malicious · 417ae2d5f5111ddf

MALICIOUS

Office (OLE) / .XLS

252.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2023-01-03

MD5: 396498674484e0db479bc58eae082b8c SHA-1: 55d61708f9b68ad9539bfd9fb05cd555e9a6e607 SHA-256: 417ae2d5f5111ddf80b63c443e14b70ec2052b3e64a35940c9f81f262f7e526e

362 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The critical heuristics indicate the presence of a Workbook_Open macro that utilizes WScript.Shell to download and execute a file. The VBA macro source confirms the use of Shell() and CreateObject calls, consistent with downloading and running a payload. No specific family could be identified, but the behavior is typical of a macro-based downloader.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
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.
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact info 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `427db399ccacbcd06480a739cb62b7ff8778bc5f1ec2956dbca381d45a91bdfe`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	15212 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 69 long base64-like blob(s).

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