oski | 2e77a1b324229a10ce5ac15a916526eff4a1e44c291bb918d6ed5329bc56f81b

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
13-01-2024 05:51

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General

Target

8C36F8A010E9781BDA4076852EFB05A7.exe
Size

200KB
MD5

8c36f8a010e9781bda4076852efb05a7
SHA1

155d37c5d7cfda081a74080dc288a80c7ecdc643
SHA256

2e77a1b324229a10ce5ac15a916526eff4a1e44c291bb918d6ed5329bc56f81b
SHA512

5712cc4f13ab99173aae0708bf94961762625dbc78d8f77c54688c7acccd01b7117cd7f2a36120d3ae832b4f82582773b1cb00713481cd90e1944ffd6a2f8f8c
SSDEEP

3072:WfUomEuYm98dlSq7gt5q7Dx+XgS6aCEwhOfUbCalNT2pbB3fIr1Xi6FLPo3c:WfUauY68uSWCx+XA7mg2pNS1Ljo3c

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Signatures

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

Deletes itself 1 IoCs

pid	Process
2552	cmd.exe

Loads dropped DLL 3 IoCs

pid	Process
1268	8C36F8A010E9781BDA4076852EFB05A7.exe
1268	8C36F8A010E9781BDA4076852EFB05A7.exe
1268	8C36F8A010E9781BDA4076852EFB05A7.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
T1552.001
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001
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
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

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	8C36F8A010E9781BDA4076852EFB05A7.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
320	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	320	taskkill.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1268 wrote to memory of 2552	1268	8C36F8A010E9781BDA4076852EFB05A7.exe	29
PID 1268 wrote to memory of 2552	1268	8C36F8A010E9781BDA4076852EFB05A7.exe	29
PID 1268 wrote to memory of 2552	1268	8C36F8A010E9781BDA4076852EFB05A7.exe	29
PID 1268 wrote to memory of 2552	1268	8C36F8A010E9781BDA4076852EFB05A7.exe	29
PID 2552 wrote to memory of 320	2552	cmd.exe	31
PID 2552 wrote to memory of 320	2552	cmd.exe	31
PID 2552 wrote to memory of 320	2552	cmd.exe	31
PID 2552 wrote to memory of 320	2552	cmd.exe	31

C:\Users\Admin\AppData\Local\Temp\8C36F8A010E9781BDA4076852EFB05A7.exe
"C:\Users\Admin\AppData\Local\Temp\8C36F8A010E9781BDA4076852EFB05A7.exe"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:1268
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c taskkill /pid 1268 & erase C:\Users\Admin\AppData\Local\Temp\8C36F8A010E9781BDA4076852EFB05A7.exe & RD /S /Q C:\\ProgramData\\157427143777317\\* & exit
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:2552
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /pid 1268
    3⤵
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:320

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

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

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\ProgramData\nss3.dll

Filesize
1.2MB

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

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\ProgramData\sqlite3.dll

Filesize
630KB

MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

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