Analysis

  • max time kernel
    151s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    17-07-2021 19:39

General

  • Target

    astro-grep-setup.exe.doc

  • Size

    1.4MB

  • MD5

    9c3d3679ea84ff9bf67bf8c7aa2afc48

  • SHA1

    0470d616e8918ef03098741bf7fb0b313bb8aaea

  • SHA256

    2f5639932c7a25cf51737748cdc495367a9203e0a963f930f0009935109da190

  • SHA512

    6896ad9abbbaa7760825d40086270f649a82a1291798173764e20deb7a5ef7a2f4070e247f27210f77341d70b6ed7215fa72a1711210610b428fcce39006af53

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

C2

null:null

Mutex

Mutex_6SI8OkPnk

Attributes
  • aes_key

    ZgOTIhSVzSTSosv4ITYrzailHXWOHyEM

  • anti_detection

    true

  • autorun

    true

  • bdos

    false

  • delay

    SWARM-SHOP

  • host

    null

  • hwid

    20

  • install_file

  • install_folder

    %AppData%

  • mutex

    Mutex_6SI8OkPnk

  • pastebin_config

    https://pastebin.com/raw/VTByvKGM

  • port

    null

  • version

    0.5.7B

aes.plain

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers.

  • Async RAT payload 9 IoCs
  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 8 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • NSIS installer 9 IoCs
  • Office loads VBA resources, possible macro or embedded object present
  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Delays execution with timeout.exe 1 IoCs
  • Modifies Internet Explorer settings 1 TTPs 9 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 16 IoCs
  • Suspicious use of WriteProcessMemory 39 IoCs

Processes

  • C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
    "C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\astro-grep-setup.exe.doc"
    1⤵
    • Loads dropped DLL
    • Drops file in Windows directory
    • Modifies Internet Explorer settings
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:788
    • C:\ProgramData\Memsys\ms.exe
      C:\ProgramData\Memsys\ms.exe
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:344
      • C:\Users\Admin\AppData\Local\Temp\ASTRO-GREP.EXE
        "C:\Users\Admin\AppData\Local\Temp\ASTRO-GREP.EXE"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1684
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "astro-grep" /tr '"C:\Users\Admin\AppData\Roaming\astro-grep.exe"' & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:628
          • C:\Windows\SysWOW64\schtasks.exe
            schtasks /create /f /sc onlogon /rl highest /tn "astro-grep" /tr '"C:\Users\Admin\AppData\Roaming\astro-grep.exe"'
            5⤵
            • Creates scheduled task(s)
            PID:1544
        • C:\Windows\SysWOW64\cmd.exe
          cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpB37.tmp.bat""
          4⤵
          • Loads dropped DLL
          • Suspicious use of WriteProcessMemory
          PID:1676
          • C:\Windows\SysWOW64\timeout.exe
            timeout 3
            5⤵
            • Delays execution with timeout.exe
            PID:436
          • C:\Users\Admin\AppData\Roaming\astro-grep.exe
            "C:\Users\Admin\AppData\Roaming\astro-grep.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            PID:1016
      • C:\Users\Admin\AppData\Local\Temp\ASTROGREP_SETUP_V4.4.7.EXE
        "C:\Users\Admin\AppData\Local\Temp\ASTROGREP_SETUP_V4.4.7.EXE"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious behavior: GetForegroundWindowSpam
        PID:1580
    • C:\Windows\splwow64.exe
      C:\Windows\splwow64.exe 12288
      2⤵
        PID:1916

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Execution

    Scheduled Task

    1
    T1053

    Persistence

    Scheduled Task

    1
    T1053

    Privilege Escalation

    Scheduled Task

    1
    T1053

    Defense Evasion

    Modify Registry

    1
    T1112

    Discovery

    System Information Discovery

    1
    T1082

    Command and Control

    Web Service

    1
    T1102

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\ProgramData\Memsys\ms.exe
      MD5

      dbbb611daf3abd47972ae4faf5d54c95

      SHA1

      1b33772f2acc9e6673a2922587b00db86f5fba01

      SHA256

      d5a8b6cb7b39d6f71ce67c6c8e17030079f2778087ee12c0ad45bd823f7bd53c

      SHA512

      140b2d0d6ac049943f5f2c8e3bfa7ca1ad773b0878cf92f825baa2769930d068b6b2601786f94f40daf15f199b2cb9b6ce6c016130025e5f04a103ee78b06bb9

    • C:\Users\Admin\AppData\Local\Temp\ASTRO-GREP.EXE
      MD5

      432f0e0aab658de046d8b41d2cef8253

      SHA1

      7ba5b175ffb4bb976c54177f9c40a7339a088654

      SHA256

      17d1c0045155ad9c523c07e0f37aa16cd036915f38b73090d8d8ba930db149fb

      SHA512

      bac97805d8fcba49b7bde5067911b293622c610a65f2a2fc527a6c890be8e79c6ca9c9676786b1eaac19ecbdb16562efee2d7c985707fc04e57e4e3033c75b0b

    • C:\Users\Admin\AppData\Local\Temp\ASTRO-GREP.EXE
      MD5

      432f0e0aab658de046d8b41d2cef8253

      SHA1

      7ba5b175ffb4bb976c54177f9c40a7339a088654

      SHA256

      17d1c0045155ad9c523c07e0f37aa16cd036915f38b73090d8d8ba930db149fb

      SHA512

      bac97805d8fcba49b7bde5067911b293622c610a65f2a2fc527a6c890be8e79c6ca9c9676786b1eaac19ecbdb16562efee2d7c985707fc04e57e4e3033c75b0b

    • C:\Users\Admin\AppData\Local\Temp\ASTROGREP_SETUP_V4.4.7.EXE
      MD5

      a708211241313feaf9621e571631534d

      SHA1

      9f398e0cc5b2b5162d5f27a6653709f836d02998

      SHA256

      5c4faebe335fee04b25b10aa2a0e580571388bde2cc09e133c72d9d01bc09423

      SHA512

      8e2fa5f33e16879d8f5acb4ab783aa4b4b37266cd1346abef5d54f2dfeb2177af872575780e2e7cd02e462349b1c35642c0f7ba3f860034775a064e9a07b08af

    • C:\Users\Admin\AppData\Local\Temp\ASTROGREP_SETUP_V4.4.7.EXE
      MD5

      a708211241313feaf9621e571631534d

      SHA1

      9f398e0cc5b2b5162d5f27a6653709f836d02998

      SHA256

      5c4faebe335fee04b25b10aa2a0e580571388bde2cc09e133c72d9d01bc09423

      SHA512

      8e2fa5f33e16879d8f5acb4ab783aa4b4b37266cd1346abef5d54f2dfeb2177af872575780e2e7cd02e462349b1c35642c0f7ba3f860034775a064e9a07b08af

    • C:\Users\Admin\AppData\Local\Temp\tmpB37.tmp.bat
      MD5

      4500e6a7c8ff6a28c77e345dcc564e98

      SHA1

      a4821e2be1b016adac80a654fbd04c9c116b1c70

      SHA256

      43bbe857c1a3829250a8adb0412552b35aee9890afcc8ce075aa55ed53313391

      SHA512

      b540cd24bc8efaffca5732be53b6bea175c4eeb067a2fd7a3da113e93a5fed0480ddf8947fb0460844f3efba30059472f95acc703eb62e1d9500d0da446efab5

    • C:\Users\Admin\AppData\Roaming\astro-grep.exe
      MD5

      432f0e0aab658de046d8b41d2cef8253

      SHA1

      7ba5b175ffb4bb976c54177f9c40a7339a088654

      SHA256

      17d1c0045155ad9c523c07e0f37aa16cd036915f38b73090d8d8ba930db149fb

      SHA512

      bac97805d8fcba49b7bde5067911b293622c610a65f2a2fc527a6c890be8e79c6ca9c9676786b1eaac19ecbdb16562efee2d7c985707fc04e57e4e3033c75b0b

    • C:\Users\Admin\AppData\Roaming\astro-grep.exe
      MD5

      432f0e0aab658de046d8b41d2cef8253

      SHA1

      7ba5b175ffb4bb976c54177f9c40a7339a088654

      SHA256

      17d1c0045155ad9c523c07e0f37aa16cd036915f38b73090d8d8ba930db149fb

      SHA512

      bac97805d8fcba49b7bde5067911b293622c610a65f2a2fc527a6c890be8e79c6ca9c9676786b1eaac19ecbdb16562efee2d7c985707fc04e57e4e3033c75b0b

    • \ProgramData\Memsys\ms.exe
      MD5

      dbbb611daf3abd47972ae4faf5d54c95

      SHA1

      1b33772f2acc9e6673a2922587b00db86f5fba01

      SHA256

      d5a8b6cb7b39d6f71ce67c6c8e17030079f2778087ee12c0ad45bd823f7bd53c

      SHA512

      140b2d0d6ac049943f5f2c8e3bfa7ca1ad773b0878cf92f825baa2769930d068b6b2601786f94f40daf15f199b2cb9b6ce6c016130025e5f04a103ee78b06bb9

    • \ProgramData\Memsys\ms.exe
      MD5

      dbbb611daf3abd47972ae4faf5d54c95

      SHA1

      1b33772f2acc9e6673a2922587b00db86f5fba01

      SHA256

      d5a8b6cb7b39d6f71ce67c6c8e17030079f2778087ee12c0ad45bd823f7bd53c

      SHA512

      140b2d0d6ac049943f5f2c8e3bfa7ca1ad773b0878cf92f825baa2769930d068b6b2601786f94f40daf15f199b2cb9b6ce6c016130025e5f04a103ee78b06bb9

    • \Users\Admin\AppData\Local\Temp\ASTRO-GREP.EXE
      MD5

      432f0e0aab658de046d8b41d2cef8253

      SHA1

      7ba5b175ffb4bb976c54177f9c40a7339a088654

      SHA256

      17d1c0045155ad9c523c07e0f37aa16cd036915f38b73090d8d8ba930db149fb

      SHA512

      bac97805d8fcba49b7bde5067911b293622c610a65f2a2fc527a6c890be8e79c6ca9c9676786b1eaac19ecbdb16562efee2d7c985707fc04e57e4e3033c75b0b

    • \Users\Admin\AppData\Local\Temp\ASTROGREP_SETUP_V4.4.7.EXE
      MD5

      a708211241313feaf9621e571631534d

      SHA1

      9f398e0cc5b2b5162d5f27a6653709f836d02998

      SHA256

      5c4faebe335fee04b25b10aa2a0e580571388bde2cc09e133c72d9d01bc09423

      SHA512

      8e2fa5f33e16879d8f5acb4ab783aa4b4b37266cd1346abef5d54f2dfeb2177af872575780e2e7cd02e462349b1c35642c0f7ba3f860034775a064e9a07b08af

    • \Users\Admin\AppData\Local\Temp\nsiA5A3.tmp\LangDLL.dll
      MD5

      91d5e21907e4baff0145339311abf9d9

      SHA1

      f867d8529d4f3704cd4f475b46699b66cb6c2002

      SHA256

      acde373cc4916be5df3d239ab67f5980c333e979f34965ee733e7c6259586e9b

      SHA512

      339e35b89f2ac7d2fbe9dfd9a55279d20463f7c298332810c0ebaa5de95e09657f4b2837904ae16a8743c4c7abf7f3c7581099bc94312c178a21783288790401

    • \Users\Admin\AppData\Local\Temp\nsiA5A3.tmp\System.dll
      MD5

      b8992e497d57001ddf100f9c397fcef5

      SHA1

      e26ddf101a2ec5027975d2909306457c6f61cfbd

      SHA256

      98bcd1dd88642f4dd36a300c76ebb1ddfbbbc5bfc7e3b6d7435dc6d6e030c13b

      SHA512

      8823b1904dccfaf031068102cb1def7958a057f49ff369f0e061f1b4db2090021aa620bb8442a2a6ac9355bb74ee54371dc2599c20dc723755a46ede81533a3c

    • \Users\Admin\AppData\Local\Temp\nsiA5A3.tmp\nsDialogs.dll
      MD5

      70d4c5f9acc5ddf934b73fa311ade7d8

      SHA1

      6962e84782b0e1fe798cdce1d7447211228ca85b

      SHA256

      02869b76936e3c3102bb36e34b41bc989770bf81dca09f31c561bb6be52285ee

      SHA512

      40189b463173cbbad9c5101f37b4a37d970e9cd8e6f3d343cb8e54c54bdc7fdc3cfa8d7d7e7b7b0241c68768607c523be2c2c21b7efc727257731e1c5d1673fc

    • \Users\Admin\AppData\Roaming\astro-grep.exe
      MD5

      432f0e0aab658de046d8b41d2cef8253

      SHA1

      7ba5b175ffb4bb976c54177f9c40a7339a088654

      SHA256

      17d1c0045155ad9c523c07e0f37aa16cd036915f38b73090d8d8ba930db149fb

      SHA512

      bac97805d8fcba49b7bde5067911b293622c610a65f2a2fc527a6c890be8e79c6ca9c9676786b1eaac19ecbdb16562efee2d7c985707fc04e57e4e3033c75b0b

    • memory/344-66-0x0000000000000000-mapping.dmp
    • memory/436-91-0x0000000000000000-mapping.dmp
    • memory/628-87-0x0000000000000000-mapping.dmp
    • memory/788-60-0x0000000072391000-0x0000000072394000-memory.dmp
      Filesize

      12KB

    • memory/788-100-0x000000005FFF0000-0x0000000060000000-memory.dmp
      Filesize

      64KB

    • memory/788-62-0x000000005FFF0000-0x0000000060000000-memory.dmp
      Filesize

      64KB

    • memory/788-63-0x0000000075AA1000-0x0000000075AA3000-memory.dmp
      Filesize

      8KB

    • memory/788-61-0x000000006FE11000-0x000000006FE13000-memory.dmp
      Filesize

      8KB

    • memory/1016-99-0x0000000004280000-0x0000000004281000-memory.dmp
      Filesize

      4KB

    • memory/1016-94-0x0000000000000000-mapping.dmp
    • memory/1016-96-0x0000000000CC0000-0x0000000000CC1000-memory.dmp
      Filesize

      4KB

    • memory/1544-89-0x0000000000000000-mapping.dmp
    • memory/1580-74-0x0000000000000000-mapping.dmp
    • memory/1676-88-0x0000000000000000-mapping.dmp
    • memory/1684-86-0x0000000004BC0000-0x0000000004BC1000-memory.dmp
      Filesize

      4KB

    • memory/1684-70-0x0000000000000000-mapping.dmp
    • memory/1684-79-0x0000000000220000-0x0000000000221000-memory.dmp
      Filesize

      4KB

    • memory/1916-84-0x000007FEFB891000-0x000007FEFB893000-memory.dmp
      Filesize

      8KB

    • memory/1916-83-0x0000000000000000-mapping.dmp