oski | 371384518223a80ff5381a728ba1e4f846c93713bb39bc80fb2d95cdd8158241

Analysis

max time kernel
43s
max time network
48s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
29-09-2022 20:33

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General

Target

Purchase Order.pdf.exe
Size

273KB
MD5

bb5ce7931695bdec6adf8bdc1a674a14
SHA1

ac678662e2dc124111cee4ff9f180b87a8b7f2c0
SHA256

371384518223a80ff5381a728ba1e4f846c93713bb39bc80fb2d95cdd8158241
SHA512

1bde736bcafc95da870d1a51022c03de359d66b65000c50a73a070256b2fc3c971f02d70a029e1e380d544cc85eb6564bba75b2f5ea78aefac42431eabeafe7a
SSDEEP

6144:cVP0JqJ1ped5HIf7SwKCcdo1L6BQgyZVLa0pOxWW6krZKy:u0JqJenHIfnTcdnhyZVLXOwW6ktKy

Score

10^/10

oski discovery infostealer persistence spyware stealer

Malware Config

Extracted

Family

oski

�&C

o.oteqprojects.co.in

%�

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Downloads MZ/PE file

Loads dropped DLL 3 IoCs

pid	Process
784	Purchase Order.pdf.exe
784	Purchase Order.pdf.exe
784	Purchase Order.pdf.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\windows.dll = "C:\\Users\\Admin\\AppData\\Local\\Temp\\file.exe"	Purchase Order.pdf.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1380 set thread context of 2028	1380	Purchase Order.pdf.exe	27
PID 2028 set thread context of 784	2028	Purchase Order.pdf.exe	28

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	Purchase Order.pdf.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1984	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1984	taskkill.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 1380 wrote to memory of 2028	1380	Purchase Order.pdf.exe	27
PID 1380 wrote to memory of 2028	1380	Purchase Order.pdf.exe	27
PID 1380 wrote to memory of 2028	1380	Purchase Order.pdf.exe	27
PID 1380 wrote to memory of 2028	1380	Purchase Order.pdf.exe	27
PID 1380 wrote to memory of 2028	1380	Purchase Order.pdf.exe	27
PID 1380 wrote to memory of 2028	1380	Purchase Order.pdf.exe	27
PID 1380 wrote to memory of 2028	1380	Purchase Order.pdf.exe	27
PID 1380 wrote to memory of 2028	1380	Purchase Order.pdf.exe	27
PID 1380 wrote to memory of 2028	1380	Purchase Order.pdf.exe	27
PID 1380 wrote to memory of 2028	1380	Purchase Order.pdf.exe	27
PID 1380 wrote to memory of 2028	1380	Purchase Order.pdf.exe	27
PID 2028 wrote to memory of 784	2028	Purchase Order.pdf.exe	28
PID 2028 wrote to memory of 784	2028	Purchase Order.pdf.exe	28
PID 2028 wrote to memory of 784	2028	Purchase Order.pdf.exe	28
PID 2028 wrote to memory of 784	2028	Purchase Order.pdf.exe	28
PID 2028 wrote to memory of 784	2028	Purchase Order.pdf.exe	28
PID 2028 wrote to memory of 784	2028	Purchase Order.pdf.exe	28
PID 2028 wrote to memory of 784	2028	Purchase Order.pdf.exe	28
PID 2028 wrote to memory of 784	2028	Purchase Order.pdf.exe	28
PID 2028 wrote to memory of 784	2028	Purchase Order.pdf.exe	28
PID 2028 wrote to memory of 784	2028	Purchase Order.pdf.exe	28
PID 784 wrote to memory of 1668	784	Purchase Order.pdf.exe	31
PID 784 wrote to memory of 1668	784	Purchase Order.pdf.exe	31
PID 784 wrote to memory of 1668	784	Purchase Order.pdf.exe	31
PID 784 wrote to memory of 1668	784	Purchase Order.pdf.exe	31
PID 1668 wrote to memory of 1984	1668	cmd.exe	33
PID 1668 wrote to memory of 1984	1668	cmd.exe	33
PID 1668 wrote to memory of 1984	1668	cmd.exe	33
PID 1668 wrote to memory of 1984	1668	cmd.exe	33

C:\Users\Admin\AppData\Local\Temp\Purchase Order.pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Purchase Order.pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1380
- C:\Users\Admin\AppData\Local\Temp\Purchase Order.pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\Purchase Order.pdf.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:2028
- - C:\Users\Admin\AppData\Local\Temp\Purchase Order.pdf.exe
    "C:\Users\Admin\AppData\Local\Temp\Purchase Order.pdf.exe"
    3⤵
    - Loads dropped DLL
    - Checks processor information in registry
    - Suspicious use of WriteProcessMemory
    PID:784
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /pid 784 & erase C:\Users\Admin\AppData\Local\Temp\Purchase Order.pdf.exe & RD /S /Q C:\\ProgramData\\292257124098149\\* & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1668
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /pid 784
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1984

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\ProgramData\mozglue.dll

Filesize
133KB

MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
\ProgramData\nss3.dll

Filesize
1.2MB

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
\ProgramData\sqlite3.dll

Filesize
630KB

MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

Download Submit
memory/784-74-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/784-77-0x000000000040717B-mapping.dmp

Download
memory/784-89-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/784-87-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/784-82-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/784-80-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/784-76-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/784-68-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/784-67-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/784-72-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/784-70-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1668-88-0x0000000000000000-mapping.dmp

Download
memory/1984-90-0x0000000000000000-mapping.dmp

Download
memory/2028-58-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/2028-79-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/2028-66-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/2028-62-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/2028-54-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/2028-57-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/2028-55-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/2028-86-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/2028-63-0x0000000000401110-mapping.dmp

Download
memory/2028-59-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/2028-60-0x0000000000400000-0x000000000043A000-memory.dmp

Filesize
232KB

Download
memory/2028-65-0x0000000075A11000-0x0000000075A13000-memory.dmp

Filesize
8KB

Download