PO5621.scr.exe

General
Target

PO5621.scr.exe

Filesize

306KB

Completed

06-05-2021 12:07

Score
10 /10
MD5

b0926a6e4c1887f81024b17df73199c5

SHA1

3fcdd6ff8323713c8cf3e11edca6c5e195dd4139

SHA256

244cc88debf6465b93584d1f63c592c52bd029deec2f24fc4a3328725838d239

Malware Config

Extracted

Family oski
C2

203.159.80.65

Signatures 13

Filter: none

Collection
Credential Access
Discovery
  • Oski

    Description

    Oski is an infostealer targeting browser data, crypto wallets.

  • Downloads MZ/PE file
  • Loads dropped DLL
    PO5621.scr.exePO5621.scr.exe

    Reported IOCs

    pidprocess
    3152PO5621.scr.exe
    1440PO5621.scr.exe
    1440PO5621.scr.exe
    1440PO5621.scr.exe
  • Reads user/profile data of web browsers

    Description

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

    TTPs

    Data from Local SystemCredentials in Files
  • Accesses cryptocurrency files/wallets, possible credential harvesting

    Tags

    TTPs

    Data from Local SystemCredentials in Files
  • Checks installed software on the system

    Description

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

    Tags

    TTPs

    Query Registry
  • Suspicious use of SetThreadContext
    PO5621.scr.exe

    Reported IOCs

    descriptionpidprocesstarget process
    PID 3152 set thread context of 14403152PO5621.scr.exePO5621.scr.exe
  • Enumerates physical storage devices

    Description

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

    TTPs

    System Information Discovery
  • Checks processor information in registry
    PO5621.scr.exe

    Description

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

    TTPs

    Query RegistrySystem Information Discovery

    Reported IOCs

    descriptioniocprocess
    Key value queried\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameStringPO5621.scr.exe
  • Kills process with taskkill
    taskkill.exe

    Tags

    Reported IOCs

    pidprocess
    1116taskkill.exe
  • Suspicious behavior: MapViewOfSection
    PO5621.scr.exe

    Reported IOCs

    pidprocess
    3152PO5621.scr.exe
  • Suspicious use of AdjustPrivilegeToken
    taskkill.exe

    Reported IOCs

    descriptionpidprocess
    Token: SeDebugPrivilege1116taskkill.exe
  • Suspicious use of WriteProcessMemory
    PO5621.scr.exePO5621.scr.execmd.exe

    Reported IOCs

    descriptionpidprocesstarget process
    PID 3152 wrote to memory of 14403152PO5621.scr.exePO5621.scr.exe
    PID 3152 wrote to memory of 14403152PO5621.scr.exePO5621.scr.exe
    PID 3152 wrote to memory of 14403152PO5621.scr.exePO5621.scr.exe
    PID 3152 wrote to memory of 14403152PO5621.scr.exePO5621.scr.exe
    PID 1440 wrote to memory of 7401440PO5621.scr.execmd.exe
    PID 1440 wrote to memory of 7401440PO5621.scr.execmd.exe
    PID 1440 wrote to memory of 7401440PO5621.scr.execmd.exe
    PID 740 wrote to memory of 1116740cmd.exetaskkill.exe
    PID 740 wrote to memory of 1116740cmd.exetaskkill.exe
    PID 740 wrote to memory of 1116740cmd.exetaskkill.exe
Processes 4
  • C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe
    "C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe"
    Loads dropped DLL
    Suspicious use of SetThreadContext
    Suspicious behavior: MapViewOfSection
    Suspicious use of WriteProcessMemory
    PID:3152
    • C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe
      "C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe"
      Loads dropped DLL
      Checks processor information in registry
      Suspicious use of WriteProcessMemory
      PID:1440
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c taskkill /pid 1440 & erase C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe & RD /S /Q C:\\ProgramData\\664059172564134\\* & exit
        Suspicious use of WriteProcessMemory
        PID:740
        • C:\Windows\SysWOW64\taskkill.exe
          taskkill /pid 1440
          Kills process with taskkill
          Suspicious use of AdjustPrivilegeToken
          PID:1116
Network
MITRE ATT&CK Matrix
Command and Control
    Credential Access
    Defense Evasion
      Execution
        Exfiltration
          Impact
            Initial Access
              Lateral Movement
                Persistence
                  Privilege Escalation
                    Replay Monitor
                    00:00 00:00
                    Downloads
                    • \ProgramData\mozglue.dll

                      MD5

                      8f73c08a9660691143661bf7332c3c27

                      SHA1

                      37fa65dd737c50fda710fdbde89e51374d0c204a

                      SHA256

                      3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

                      SHA512

                      0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

                    • \ProgramData\nss3.dll

                      MD5

                      bfac4e3c5908856ba17d41edcd455a51

                      SHA1

                      8eec7e888767aa9e4cca8ff246eb2aacb9170428

                      SHA256

                      e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

                      SHA512

                      2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

                    • \ProgramData\sqlite3.dll

                      MD5

                      e477a96c8f2b18d6b5c27bde49c990bf

                      SHA1

                      e980c9bf41330d1e5bd04556db4646a0210f7409

                      SHA256

                      16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

                      SHA512

                      335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

                    • \Users\Admin\AppData\Local\Temp\nsa1563.tmp\9ma115elvnv.dll

                      MD5

                      8102c61b4698d608f7912b3979dc60a9

                      SHA1

                      48741a2b677d4214dce9dd7fdc8c09f0c71273e4

                      SHA256

                      b4e1b5a689c836a40a478137f6335f193f0eda0a90f8bd7868c6e7bc96f30fe3

                      SHA512

                      495be5aef1a63b6270aa0f92c68f13c21e16ef3ddd943507f66af25659dc1aa0b465d1e857af06f42fe05983b07ef1d3b0c96a7a595d84066517264d70640a8d

                    • memory/740-121-0x0000000000000000-mapping.dmp

                    • memory/1116-122-0x0000000000000000-mapping.dmp

                    • memory/1440-117-0x0000000000400000-0x0000000000438000-memory.dmp

                    • memory/1440-116-0x000000000040717B-mapping.dmp

                    • memory/3152-115-0x00000000026B0000-0x00000000026B2000-memory.dmp