oski | bef42b4bb33bf2edb112d4e084df6e7aaad37b429b00ac783b9fe14eb08ac3f6

General

Target

8325e7768964ebee192622a378e7f28f.exe
Size

747KB
MD5

8325e7768964ebee192622a378e7f28f
SHA1

47ad27a29e5d3c8449fe41287bc3957bb8c37aff
SHA256

bef42b4bb33bf2edb112d4e084df6e7aaad37b429b00ac783b9fe14eb08ac3f6
SHA512

ba2fd924cd43d9fd4dce8956e22dbe8e33c11fe35e8acf5262dd18e102a6dcf49e931dd532f96a759e87ebccc00d55255aac67c438fb689a2ea41f6cdcf0e465

Score

10^/10

oski discovery evasion infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

http://37.0.11.237/nn/

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Downloads MZ/PE file
Looks for VMWare Tools registry key 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

8325e7768964ebee192622a378e7f28f.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	8325e7768964ebee192622a378e7f28f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	8325e7768964ebee192622a378e7f28f.exe

Loads dropped DLL 3 IoCs

Processes:

8325e7768964ebee192622a378e7f28f.exe

pid process

2116 8325e7768964ebee192622a378e7f28f.exe
2116 8325e7768964ebee192622a378e7f28f.exe
2116 8325e7768964ebee192622a378e7f28f.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
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

pid	process
2116	8325e7768964ebee192622a378e7f28f.exe
2116	8325e7768964ebee192622a378e7f28f.exe
2116	8325e7768964ebee192622a378e7f28f.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

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

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

8325e7768964ebee192622a378e7f28f.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	8325e7768964ebee192622a378e7f28f.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum\0	8325e7768964ebee192622a378e7f28f.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

8325e7768964ebee192622a378e7f28f.exe

description pid process target process

PID 4020 set thread context of 2116 4020 8325e7768964ebee192622a378e7f28f.exe 8325e7768964ebee192622a378e7f28f.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	pid	process	target process
PID 4020 set thread context of 2116	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe

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

Processes:

8325e7768964ebee192622a378e7f28f.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	8325e7768964ebee192622a378e7f28f.exe

Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

2544 taskkill.exe

pid	process
2544	taskkill.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

8325e7768964ebee192622a378e7f28f.exe

pid	process
4020	8325e7768964ebee192622a378e7f28f.exe
4020	8325e7768964ebee192622a378e7f28f.exe
4020	8325e7768964ebee192622a378e7f28f.exe
4020	8325e7768964ebee192622a378e7f28f.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

8325e7768964ebee192622a378e7f28f.exetaskkill.exe

description pid process

Token: SeDebugPrivilege 4020 8325e7768964ebee192622a378e7f28f.exe
Token: SeDebugPrivilege 2544 taskkill.exe

description	pid	process
Token: SeDebugPrivilege	4020	8325e7768964ebee192622a378e7f28f.exe
Token: SeDebugPrivilege	2544	taskkill.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

8325e7768964ebee192622a378e7f28f.exe8325e7768964ebee192622a378e7f28f.execmd.exe

C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe
"C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe"
1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4020

C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe
"C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe"
2⤵
PID:4036

C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe
"C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe"
2⤵
PID:2032

C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe
"C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:2116

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 2116 & erase C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe & RD /S /Q C:\\ProgramData\\176971493033401\\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:1048

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 2116
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:2544

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Credentials in Files

2

T1081

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

4

T1082

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

\ProgramData\mozglue.dll

MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
\ProgramData\nss3.dll

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
\ProgramData\sqlite3.dll

MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

Download Submit
memory/1048-132-0x0000000000000000-mapping.dmp

Download
memory/2116-126-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2116-128-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2116-127-0x000000000040717B-mapping.dmp

Download
memory/2544-133-0x0000000000000000-mapping.dmp

Download
memory/4020-119-0x00000000025F0000-0x00000000025F1000-memory.dmp

Filesize
4KB

Download
memory/4020-124-0x000000000AB10000-0x000000000AB59000-memory.dmp

Filesize
292KB

Download
memory/4020-125-0x000000000DC00000-0x000000000DC01000-memory.dmp

Filesize
4KB

Download
memory/4020-123-0x0000000008380000-0x00000000083F4000-memory.dmp

Filesize
464KB

Download
memory/4020-122-0x00000000050A0000-0x00000000050AF000-memory.dmp

Filesize
60KB

Download
memory/4020-121-0x0000000004D40000-0x0000000004D41000-memory.dmp

Filesize
4KB

Download
memory/4020-120-0x00000000025E0000-0x00000000025E1000-memory.dmp

Filesize
4KB

Download
memory/4020-114-0x0000000000270000-0x0000000000271000-memory.dmp

Filesize
4KB

Download
memory/4020-118-0x0000000004CA0000-0x0000000004CA1000-memory.dmp

Filesize
4KB

Download
memory/4020-117-0x00000000052B0000-0x00000000052B1000-memory.dmp

Filesize
4KB

Download
memory/4020-116-0x0000000002610000-0x0000000002611000-memory.dmp

Filesize
4KB

Download

description	pid	process	target process
PID 4020 wrote to memory of 4036	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 4036	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 4036	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2032	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2032	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2032	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2116	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2116	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2116	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2116	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2116	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2116	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2116	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2116	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 4020 wrote to memory of 2116	4020	8325e7768964ebee192622a378e7f28f.exe	8325e7768964ebee192622a378e7f28f.exe
PID 2116 wrote to memory of 1048	2116	8325e7768964ebee192622a378e7f28f.exe	cmd.exe
PID 2116 wrote to memory of 1048	2116	8325e7768964ebee192622a378e7f28f.exe	cmd.exe
PID 2116 wrote to memory of 1048	2116	8325e7768964ebee192622a378e7f28f.exe	cmd.exe
PID 1048 wrote to memory of 2544	1048	cmd.exe	taskkill.exe
PID 1048 wrote to memory of 2544	1048	cmd.exe	taskkill.exe
PID 1048 wrote to memory of 2544	1048	cmd.exe	taskkill.exe

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads