Sload Office (OLE) / .XLS malware analysis — malicious · 6122dce9933f0347

MALICIOUS

Office (OLE) / .XLS

38.0 KB Created: 2022-04-07 07:26:18 Authoring application: Microsoft Excel First seen: 2022-04-08

MD5: eccc1d5afe2f72a48203944b1abf01a3 SHA-1: 32597a76c5e04fa67b6199bc9817ebdb9e1b7f71 SHA-256: 6122dce9933f03479b3d98aea0785ae26737644262ac9ee8a67cbfbf11050f13

368 Risk Score

Malware Insights

Sload · confidence 95%

MITRE ATT&CK

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

The Workbook_Open macro in the VBA script is obfuscated and uses CreateObject to download a second-stage executable from 'http://transfer.sh/Uv5XFY/0000.LPCd2022.exe'. The downloaded file is saved to the temporary directory as 'dropper.exe' and then executed. This indicates a downloader or dropper functionality, consistent with the Sload family.

Heuristics 9

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.
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
ClamAV: Xls.Malware.Sload-7135989-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Sload-7135989-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject 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
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` `5fb46aea1e3dfbdf4dc309862d3d2147df4acfb4ced0c9d12761de68e59e0723`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4390 bytes

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