oski | 8d35a509c8341803a0e7f804817f4870c68274bb47523018b8842e759252d9ea

General

Target

dhl.exe
Size

4.9MB
MD5

28c49dff3e6cce47ac148f844d5f657f
SHA1

fb5c3e86cf44dc8c627d4d78bcbb56e0d06ceaa9
SHA256

8d35a509c8341803a0e7f804817f4870c68274bb47523018b8842e759252d9ea
SHA512

0e68853476ccc6670ad27b5be2da6dbd465954b1a3a045c5426dc5cd038985138b3f387ec77c9a3a4fa04a3212763efe95baf48981438350600c6d7349cac7c3

Score

10^/10

oski discovery infostealer spyware stealer suricata

Malware Config

Extracted

Family

oski

C2

domazy.ga

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
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
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2
suricata
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (passwords.txt) M2
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (passwords.txt) M2
suricata
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
suricata
Downloads MZ/PE file
Loads dropped DLL 3 IoCs

Processes:

RegAsm.exe

pid process

1036 RegAsm.exe
1036 RegAsm.exe
1036 RegAsm.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
Suspicious use of SetThreadContext 1 IoCs

Processes:

dhl.exe

description pid process target process

PID 388 set thread context of 1036 388 dhl.exe RegAsm.exe
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

Processes:

RegAsm.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString RegAsm.exe
Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1052 taskkill.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

dhl.exetaskkill.exe

description pid process

Token: SeDebugPrivilege 388 dhl.exe
Token: SeDebugPrivilege 1052 taskkill.exe

pid	process
1036	RegAsm.exe
1036	RegAsm.exe
1036	RegAsm.exe

description	pid	process	target process
PID 388 set thread context of 1036	388	dhl.exe	RegAsm.exe

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

pid	process
1052	taskkill.exe

description	pid	process
Token: SeDebugPrivilege	388	dhl.exe
Token: SeDebugPrivilege	1052	taskkill.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

dhl.exeRegAsm.execmd.exe

description	pid	process	target process
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 388 wrote to memory of 1036	388	dhl.exe	RegAsm.exe
PID 1036 wrote to memory of 1788	1036	RegAsm.exe	cmd.exe
PID 1036 wrote to memory of 1788	1036	RegAsm.exe	cmd.exe
PID 1036 wrote to memory of 1788	1036	RegAsm.exe	cmd.exe
PID 1036 wrote to memory of 1788	1036	RegAsm.exe	cmd.exe
PID 1788 wrote to memory of 1052	1788	cmd.exe	taskkill.exe
PID 1788 wrote to memory of 1052	1788	cmd.exe	taskkill.exe
PID 1788 wrote to memory of 1052	1788	cmd.exe	taskkill.exe
PID 1788 wrote to memory of 1052	1788	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\dhl.exe
"C:\Users\Admin\AppData\Local\Temp\dhl.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:388

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319\\RegAsm.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:1036

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 1036 & erase C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe & RD /S /Q C:\\ProgramData\\152259179566025\\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:1788

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 1036
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1052

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

2

T1081

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Exfiltration

Command and Control

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/388-55-0x0000000000C00000-0x0000000000C80000-memory.dmp

Filesize
512KB

Download
memory/388-54-0x0000000000FD0000-0x00000000014B8000-memory.dmp

Filesize
4.9MB

Download
memory/1036-59-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1036-63-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1036-65-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1036-66-0x000000000040717B-mapping.dmp

Download
memory/1036-68-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1036-69-0x0000000075AE1000-0x0000000075AE3000-memory.dmp

Filesize
8KB

Download
memory/1036-71-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1036-61-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1036-57-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1036-56-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1036-76-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1052-77-0x0000000000000000-mapping.dmp

Download
memory/1788-75-0x0000000000000000-mapping.dmp

Download

Analysis

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