BRIEF.pdf

General
Target

BRIEF.pdf

Filesize

238KB

Completed

14-10-2021 05:04

Score
1/10
MD5

d9eb117180673e30f6e56350ec72de59

SHA1

78392960cc53f8df04ffe856b271662ad2a89e00

SHA256

8a5fb3b82134ca2b6e924355ff8673dca2d15cbc765fd5744a9a99df7b0a9b79

Malware Config
Signatures 6

Filter: none

Defense Evasion
Discovery
  • Checks processor information in registry
    AcroRd32.exe

    Description

    Processor information is often read in order to detect sandboxing environments.

    TTPs

    Query RegistrySystem Information Discovery

    Reported IOCs

    descriptioniocprocess
    Key opened\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0AcroRd32.exe
    Key value queried\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHzAcroRd32.exe
  • Modifies Internet Explorer settings
    AcroRd32.exe

    TTPs

    Modify Registry

    Reported IOCs

    descriptioniocprocess
    Key created\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATIONAcroRd32.exe
  • Suspicious behavior: EnumeratesProcesses
    AcroRd32.exe

    Reported IOCs

    pidprocess
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
  • Suspicious use of FindShellTrayWindow
    AcroRd32.exe

    Reported IOCs

    pidprocess
    856AcroRd32.exe
  • Suspicious use of SetWindowsHookEx
    AcroRd32.exe

    Reported IOCs

    pidprocess
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
    856AcroRd32.exe
  • Suspicious use of WriteProcessMemory
    AcroRd32.exeRdrCEF.exe

    Reported IOCs

    descriptionpidprocesstarget process
    PID 856 wrote to memory of 2876856AcroRd32.exeRdrCEF.exe
    PID 856 wrote to memory of 2876856AcroRd32.exeRdrCEF.exe
    PID 856 wrote to memory of 2876856AcroRd32.exeRdrCEF.exe
    PID 856 wrote to memory of 744856AcroRd32.exeRdrCEF.exe
    PID 856 wrote to memory of 744856AcroRd32.exeRdrCEF.exe
    PID 856 wrote to memory of 744856AcroRd32.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 12402876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
    PID 2876 wrote to memory of 22962876RdrCEF.exeRdrCEF.exe
Processes 9
  • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe
    "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe" "C:\Users\Admin\AppData\Local\Temp\BRIEF.pdf"
    Checks processor information in registry
    Modifies Internet Explorer settings
    Suspicious behavior: EnumeratesProcesses
    Suspicious use of FindShellTrayWindow
    Suspicious use of SetWindowsHookEx
    Suspicious use of WriteProcessMemory
    PID:856
    • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
      "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --backgroundcolor=16514043
      Suspicious use of WriteProcessMemory
      PID:2876
      • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
        "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=F3B57C7DBFDC182A43CCF20EAF98AE8B --mojo-platform-channel-handle=1636 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:2
        PID:1240
      • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
        "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=renderer --disable-browser-side-navigation --disable-gpu-compositing --service-pipe-token=F9211BF785B465C3A75860FF90D1ECC8 --lang=en-US --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --enable-pinch --device-scale-factor=1 --num-raster-threads=1 --enable-gpu-async-worker-context --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,3553;0,11,3553;0,12,3553;0,13,3553;0,14,3553;0,15,3553;0,16,3553;0,17,3553;0,18,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,3553;1,11,3553;1,12,3553;1,13,3553;1,14,3553;1,15,3553;1,16,3553;1,17,3553;1,18,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,3553;2,11,3553;2,12,3553;2,13,3553;2,14,3553;2,15,3553;2,16,3553;2,17,3553;2,18,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,3553;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,3553;3,13,3553;3,14,3553;3,15,3553;3,16,3553;3,17,3553;3,18,3553;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,3553;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,3553;4,13,3553;4,14,3553;4,15,3553;4,16,3553;4,17,3553;4,18,3553;5,0,3553;5,1,3553;5,2,3553;5,3,3553;5,4,3553;5,5,3553;5,6,3553;5,7,3553;5,8,3553;5,9,3553;5,10,3553;5,11,3553;5,12,3553;5,13,3553;5,14,3553;5,15,3553;5,16,3553;5,17,3553;5,18,3553;6,0,3553;6,1,3553;6,2,3553;6,3,3553;6,4,3553;6,5,3553;6,6,3553;6,7,3553;6,8,3553;6,9,3553;6,10,3553;6,11,3553;6,12,3553;6,13,3553;6,14,3553;6,15,3553;6,16,3553;6,17,3553;6,18,3553 --disable-accelerated-video-decode --service-request-channel-token=F9211BF785B465C3A75860FF90D1ECC8 --renderer-client-id=2 --mojo-platform-channel-handle=1652 --allow-no-sandbox-job /prefetch:1
        PID:2296
      • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
        "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=renderer --disable-browser-side-navigation --disable-gpu-compositing --service-pipe-token=46081389DECAFFC2E3D8CC72C1EEEEC1 --lang=en-US --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --enable-pinch --device-scale-factor=1 --num-raster-threads=1 --enable-gpu-async-worker-context --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,3553;0,11,3553;0,12,3553;0,13,3553;0,14,3553;0,15,3553;0,16,3553;0,17,3553;0,18,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,3553;1,11,3553;1,12,3553;1,13,3553;1,14,3553;1,15,3553;1,16,3553;1,17,3553;1,18,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,3553;2,11,3553;2,12,3553;2,13,3553;2,14,3553;2,15,3553;2,16,3553;2,17,3553;2,18,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,3553;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,3553;3,13,3553;3,14,3553;3,15,3553;3,16,3553;3,17,3553;3,18,3553;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,3553;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,3553;4,13,3553;4,14,3553;4,15,3553;4,16,3553;4,17,3553;4,18,3553;5,0,3553;5,1,3553;5,2,3553;5,3,3553;5,4,3553;5,5,3553;5,6,3553;5,7,3553;5,8,3553;5,9,3553;5,10,3553;5,11,3553;5,12,3553;5,13,3553;5,14,3553;5,15,3553;5,16,3553;5,17,3553;5,18,3553;6,0,3553;6,1,3553;6,2,3553;6,3,3553;6,4,3553;6,5,3553;6,6,3553;6,7,3553;6,8,3553;6,9,3553;6,10,3553;6,11,3553;6,12,3553;6,13,3553;6,14,3553;6,15,3553;6,16,3553;6,17,3553;6,18,3553 --disable-accelerated-video-decode --service-request-channel-token=46081389DECAFFC2E3D8CC72C1EEEEC1 --renderer-client-id=4 --mojo-platform-channel-handle=2064 --allow-no-sandbox-job /prefetch:1
        PID:1956
      • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
        "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=C3CB34562B3B8870319A806096C6D326 --mojo-platform-channel-handle=2468 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:2
        PID:3728
      • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
        "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=D237D2EA9D634D3BDCFB3A07D6E6757E --mojo-platform-channel-handle=2476 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:2
        PID:3384
      • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
        "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=962D1009F20D247AE381F8DFF3B8ADB4 --mojo-platform-channel-handle=2484 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:2
        PID:3196
    • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
      "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --backgroundcolor=16514043
      PID:744
Network
MITRE ATT&CK Matrix
Collection
    Command and Control
      Credential Access
        Defense Evasion
        Execution
          Exfiltration
            Impact
              Initial Access
                Lateral Movement
                  Persistence
                    Privilege Escalation
                      Replay Monitor
                      00:00 00:00
                      Downloads
                      • memory/744-115-0x0000000000000000-mapping.dmp

                      • memory/1240-119-0x0000000001160000-0x0000000001161000-memory.dmp

                      • memory/1240-118-0x0000000000000000-mapping.dmp

                      • memory/1240-117-0x0000000001538000-0x0000000001539000-memory.dmp

                      • memory/1240-116-0x0000000077912000-0x0000000077913000-memory.dmp

                      • memory/1956-126-0x0000000077912000-0x0000000077913000-memory.dmp

                      • memory/1956-127-0x0000000001325000-0x0000000001326000-memory.dmp

                      • memory/1956-128-0x0000000000000000-mapping.dmp

                      • memory/2296-122-0x0000000000000000-mapping.dmp

                      • memory/2296-124-0x00000000006B0000-0x00000000006B1000-memory.dmp

                      • memory/2296-125-0x0000000001190000-0x0000000001191000-memory.dmp

                      • memory/2296-120-0x0000000077912000-0x0000000077913000-memory.dmp

                      • memory/2296-121-0x0000000001172000-0x0000000001173000-memory.dmp

                      • memory/2876-114-0x0000000000000000-mapping.dmp

                      • memory/3196-141-0x0000000001176000-0x0000000001177000-memory.dmp

                      • memory/3196-140-0x0000000077912000-0x0000000077913000-memory.dmp

                      • memory/3196-142-0x0000000000000000-mapping.dmp

                      • memory/3384-137-0x0000000001537000-0x0000000001538000-memory.dmp

                      • memory/3384-136-0x0000000077912000-0x0000000077913000-memory.dmp

                      • memory/3384-138-0x0000000000000000-mapping.dmp

                      • memory/3728-132-0x0000000077912000-0x0000000077913000-memory.dmp

                      • memory/3728-133-0x0000000001171000-0x0000000001172000-memory.dmp

                      • memory/3728-134-0x0000000000000000-mapping.dmp