Malicious PE Executable analysis – a42d7ac3e39b

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File

Type

Corrupted Microsoft Office Document

Detection

PeID

BobSoft Mini Delphi -> BoB / BobSoftBorland Delphi 4.0Borland Delphi v3.0Borland Delphi v6.0 - v7.0Borland Delphi v6.0 - v7.0D1S1G v1.1 beta --> D1ND1S1G v1.1 beta --> D1NMicrosoft Visual C++ v6.0 DLLPe123 v2006.4.4-4.12

8 malicious · 73 files

EXEa42d7ac3e39b15e4c08bbb4040a6da46

Structure

XLS[Repaired @0x00238FB8]

XML[Content_Types].xml

BIN_rels

BINxl

BIN_rels

XMLworkbook.xml

OFFvbaProject.bin

BIN.

BINRoot Entry

BINVBA

BINdir

BIN__SRP_0

BIN__SRP_1

BIN__SRP_2

BIN__SRP_3

VBAThisWorkbook

VBS[Stored VBA]

VBS[Stored VBA].deobfuscated.vbs

VBA[PCode]

VBS[Decompiled VBA]

VBS[Decompiled VBA].deobfuscated.vbs

BIN_VBA_PROJECT

BINPROJECT

BINPROJECTwm

BINtheme

XMLstyles.xml

BINworksheets

BINdocProps

BINResources

Config. Field	Value
URL #1	https:huhuhuhuhuhuhuhuhuhuhu
URL #2	https:huhuhuhuhuhuhuhuhuhuhu

We extracted this malware's full configuration (C2, credentials, campaign IDs…).

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	Module Name0
	ThisWorkbook	Blacklist VBA VBA Macro
PCode Decompiled VBA Stored VBA Partial Diff. Full Diff. Missing P-Code: The Office document under analysis has been identified as having undergone VBA Purging techniques, as the P-Code block within the document is currently inaccessible. As a result, the decompilation of the code was not possible, leaving only the stored code available in textual format for analysis. VBA Purging essentially involves the elimination of the PerformanceCache section from the module streams. To fully erase any traces of the P-Code section, the MODULEOFFSET between the two sections is adjusted to 0 by altering the _VBA_PROJECT stream, and all SRP streams that also house PerformanceCache data are removed. Following the removal of the compiled code, antivirus engines and Yara rules, which depend on precise string matches, are rendered ineffective. This allows macros to bypass them effortlessly, owing to the compressed format of the remaining source code.