Analysis

  • max time kernel
    126s
  • max time network
    135s
  • platform
    windows10_x64
  • resource
    win10-en-20211014
  • submitted
    19-10-2021 14:29

General

  • Target

    c81d1895f7472cec079c7f12419feaf0.exe

  • Size

    820KB

  • MD5

    c81d1895f7472cec079c7f12419feaf0

  • SHA1

    729557420c331200cbad77b7f98a0f5841933a63

  • SHA256

    6aae67d87cd2ef23c4b9265c8e83db5142f00154e66e47b1e54219cea794682b

  • SHA512

    9fbb32e99b3a321f5c5ea1c2bea24249ca5b335514f3f6a70342609932a45aab324d71030febbd18b0aa6d63698146a384ba37da17f7a84d4018ab48660d52cc

Malware Config

Extracted

Family

vidar

Version

41.3

Botnet

517

C2

https://mas.to/@oleg98

Attributes
  • profile_id

    517

Extracted

Family

djvu

C2

http://rlrz.org/fhsgtsspen6

Signatures

  • Detected Djvu ransomware 6 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request

    suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request

  • suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

    suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

  • suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload

    suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload

  • suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

    suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

  • Vidar Stealer 4 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 2 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • 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
  • Kills process with taskkill 1 IoCs
  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 61 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe
    "C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2068
    • C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe
      "C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe"
      2⤵
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1060
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\f708d81e-f173-4e0e-b5ad-06d497c5dfaf" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:908
      • C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe
        "C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3948
        • C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe
          "C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3292
          • C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe
            "C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:3952
            • C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe
              "C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe"
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Checks processor information in registry
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of WriteProcessMemory
              PID:188
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /c taskkill /im build2.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe" & del C:\ProgramData\*.dll & exit
                7⤵
                • Suspicious use of WriteProcessMemory
                PID:1156
                • C:\Windows\SysWOW64\taskkill.exe
                  taskkill /im build2.exe /f
                  8⤵
                  • Kills process with taskkill
                  • Suspicious use of AdjustPrivilegeToken
                  PID:2400
                • C:\Windows\SysWOW64\timeout.exe
                  timeout /t 6
                  8⤵
                  • Delays execution with timeout.exe
                  PID:1996
          • C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build3.exe
            "C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:2488
            • C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build3.exe
              "C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build3.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:1740
              • C:\Windows\SysWOW64\schtasks.exe
                /C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"
                7⤵
                • Creates scheduled task(s)
                PID:1564

Network

MITRE ATT&CK Matrix ATT&CK v6

Execution

Scheduled Task

1
T1053

Persistence

Registry Run Keys / Startup Folder

1
T1060

Scheduled Task

1
T1053

Privilege Escalation

Scheduled Task

1
T1053

Defense Evasion

File Permissions Modification

1
T1222

Modify Registry

2
T1112

Install Root Certificate

1
T1130

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

2
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

3
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
    MD5

    3183751859498c44f6d0ee8e2aab2c17

    SHA1

    3948927d001256209b5e4b25003c3c4ccb9ad6bc

    SHA256

    fd7b40ffbaccd347c4daa2d0530a3b74114fcb55c78423d67750a8be92c70a28

    SHA512

    88de4b4c2818650f7080a9afdcbe8764f1604bbf77f08f2ce286beb5a00e6cb30352f6180f64e7b5d9790a1e5ebefde6e62d8221e55228942d5652a1e0cd4fa6

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
    MD5

    98a2414b3a6062f69b5e91e8ef853e60

    SHA1

    a7c76d8cc77cc535d73bc6b0ee4f64527572145d

    SHA256

    cea0b3398c3a6ac31f4582a21afb131878dfd3e489d101af94fd3d682000dba3

    SHA512

    d186ac4f87a04cc56d2a120d1aa7d96f1574ac7353a7d8b237452260f11a3ebfadb556eb46ee894c75ae1bdc6dae480599c6109eb25873074546847d158dddda

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
    MD5

    dfb909eacfd71feada81d60f6328d0de

    SHA1

    50135dbdd56568d56627854f69bf4acde78625ee

    SHA256

    85889f28da18c3f43988fa269aa0ac979cb08c787639957c663392ec7ac4cd33

    SHA512

    979f7ceb7e092753d1fe37186917eb846d5878877096ae3848d8c6a267a899da0f959910b1b024277e6181e5658773177ffbedcbbfd02834aeb18563cdfa739e

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
    MD5

    e5b95e79a31323a7b39c2116df264a7b

    SHA1

    da12e2e2cf60bd2c0627a32a8180293afbd3dfb4

    SHA256

    9bc5a0105f726592565eb96da0c345b5c377a95f40bbad4db4a9ee8724a86d2c

    SHA512

    3900ad9ea95c6f9e3b1b53bb3bb77430253c6342a79ca1a6ac9380c0e7c069213339a0df343491fa0624d5464c3241f79ff2d3424c7e6511a93d774d69f285b8

  • C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe
    MD5

    673a786d98cb5709caaf1797142e0e6e

    SHA1

    4e2abf2aa7c9418a34815dc02c272a859eea23a6

    SHA256

    b115531ef23c109fb58c392379b7f55eff11169e1317b263da60edd9ac98f6b1

    SHA512

    83fcccd08944e8c578482a945d38f756ef7cb959d6796c3830fb3e582205c5924b7bb1fb495aaffeacb2f7ac838730e5e7c01e6dcce54ea624be98635b3e3044

  • C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe
    MD5

    673a786d98cb5709caaf1797142e0e6e

    SHA1

    4e2abf2aa7c9418a34815dc02c272a859eea23a6

    SHA256

    b115531ef23c109fb58c392379b7f55eff11169e1317b263da60edd9ac98f6b1

    SHA512

    83fcccd08944e8c578482a945d38f756ef7cb959d6796c3830fb3e582205c5924b7bb1fb495aaffeacb2f7ac838730e5e7c01e6dcce54ea624be98635b3e3044

  • C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe
    MD5

    673a786d98cb5709caaf1797142e0e6e

    SHA1

    4e2abf2aa7c9418a34815dc02c272a859eea23a6

    SHA256

    b115531ef23c109fb58c392379b7f55eff11169e1317b263da60edd9ac98f6b1

    SHA512

    83fcccd08944e8c578482a945d38f756ef7cb959d6796c3830fb3e582205c5924b7bb1fb495aaffeacb2f7ac838730e5e7c01e6dcce54ea624be98635b3e3044

  • C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build3.exe
    MD5

    0fea771099e342facd95a9d659548919

    SHA1

    9f8b56a37870f8b4ac5aa0ff5677a666f94c7197

    SHA256

    6f032f671284b3812373e90b0ab5b16ea737bd7dc87d22b8f2aabe558334e403

    SHA512

    2c1eeb2909acdc1ac36a677dba5131775e97dd107cd60f03bc6672be1791b2dd83a9f588719cb376cc4771570c6b2c202e783e30450ae3c2aa48bbaf2ee049c3

  • C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build3.exe
    MD5

    0fea771099e342facd95a9d659548919

    SHA1

    9f8b56a37870f8b4ac5aa0ff5677a666f94c7197

    SHA256

    6f032f671284b3812373e90b0ab5b16ea737bd7dc87d22b8f2aabe558334e403

    SHA512

    2c1eeb2909acdc1ac36a677dba5131775e97dd107cd60f03bc6672be1791b2dd83a9f588719cb376cc4771570c6b2c202e783e30450ae3c2aa48bbaf2ee049c3

  • C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build3.exe
    MD5

    0fea771099e342facd95a9d659548919

    SHA1

    9f8b56a37870f8b4ac5aa0ff5677a666f94c7197

    SHA256

    6f032f671284b3812373e90b0ab5b16ea737bd7dc87d22b8f2aabe558334e403

    SHA512

    2c1eeb2909acdc1ac36a677dba5131775e97dd107cd60f03bc6672be1791b2dd83a9f588719cb376cc4771570c6b2c202e783e30450ae3c2aa48bbaf2ee049c3

  • C:\Users\Admin\AppData\Local\f708d81e-f173-4e0e-b5ad-06d497c5dfaf\c81d1895f7472cec079c7f12419feaf0.exe
    MD5

    c81d1895f7472cec079c7f12419feaf0

    SHA1

    729557420c331200cbad77b7f98a0f5841933a63

    SHA256

    6aae67d87cd2ef23c4b9265c8e83db5142f00154e66e47b1e54219cea794682b

    SHA512

    9fbb32e99b3a321f5c5ea1c2bea24249ca5b335514f3f6a70342609932a45aab324d71030febbd18b0aa6d63698146a384ba37da17f7a84d4018ab48660d52cc

  • \ProgramData\mozglue.dll
    MD5

    8f73c08a9660691143661bf7332c3c27

    SHA1

    37fa65dd737c50fda710fdbde89e51374d0c204a

    SHA256

    3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

    SHA512

    0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

  • \ProgramData\nss3.dll
    MD5

    bfac4e3c5908856ba17d41edcd455a51

    SHA1

    8eec7e888767aa9e4cca8ff246eb2aacb9170428

    SHA256

    e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

    SHA512

    2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

  • memory/188-139-0x0000000000400000-0x00000000004D9000-memory.dmp
    Filesize

    868KB

  • memory/188-136-0x00000000004A192D-mapping.dmp
  • memory/188-135-0x0000000000400000-0x00000000004D9000-memory.dmp
    Filesize

    868KB

  • memory/908-120-0x0000000000000000-mapping.dmp
  • memory/1060-119-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/1060-118-0x0000000000424141-mapping.dmp
  • memory/1060-117-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/1156-152-0x0000000000000000-mapping.dmp
  • memory/1564-149-0x0000000000000000-mapping.dmp
  • memory/1740-151-0x0000000000400000-0x0000000000406000-memory.dmp
    Filesize

    24KB

  • memory/1740-147-0x0000000000401AFA-mapping.dmp
  • memory/1740-146-0x0000000000400000-0x0000000000406000-memory.dmp
    Filesize

    24KB

  • memory/1996-154-0x0000000000000000-mapping.dmp
  • memory/2068-115-0x0000000004A16000-0x0000000004AA7000-memory.dmp
    Filesize

    580KB

  • memory/2068-116-0x0000000004AB0000-0x0000000004BCB000-memory.dmp
    Filesize

    1.1MB

  • memory/2400-153-0x0000000000000000-mapping.dmp
  • memory/2488-150-0x0000000003380000-0x00000000034CA000-memory.dmp
    Filesize

    1.3MB

  • memory/2488-140-0x0000000000000000-mapping.dmp
  • memory/3292-125-0x0000000000424141-mapping.dmp
  • memory/3292-130-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/3948-123-0x0000000004AA0000-0x0000000004B31000-memory.dmp
    Filesize

    580KB

  • memory/3948-122-0x0000000000000000-mapping.dmp
  • memory/3952-138-0x00000000033E0000-0x00000000034B6000-memory.dmp
    Filesize

    856KB

  • memory/3952-134-0x0000000001956000-0x00000000019D2000-memory.dmp
    Filesize

    496KB

  • memory/3952-131-0x0000000000000000-mapping.dmp