oski | e60a8a900480ed3d410440b2805a6bfe7d34dd704afa809851cf74ce68358859

General

Target

Purchase Order.pdf.exe
Size

1.1MB
MD5

59fe7f9b463780a6d838c46cef1844aa
SHA1

7f804ea8fbf9485b3b64322a90225f733e213c52
SHA256

e60a8a900480ed3d410440b2805a6bfe7d34dd704afa809851cf74ce68358859
SHA512

919711ee14d4ada6c7b442c6f789be2a3f42b3dfbdb899bc5daf4014ccdea5dbfa8afdddf2b139f8fb5c6bc52a5a220254985c4b20d212b09dbed4b16fc24860
SSDEEP

12288:+cfAmIbRN8XxzKJ2uLZzQkDsRLI3/EzSzKvF5S6c5ofg70kaX84hGoJPF5Co440r:VnIbRuFTkZ1WwZz6Rwoo7A1xXCod0QM

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

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

Processes:

Purchase Order.pdf.exe

pid process

468 Purchase Order.pdf.exe
468 Purchase Order.pdf.exe
468 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
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:

Purchase Order.pdf.exe

description pid process target process

PID 1244 set thread context of 468 1244 Purchase Order.pdf.exe Purchase Order.pdf.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:

Purchase Order.pdf.exe

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

Processes:

taskkill.exe

pid process

1096 taskkill.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

taskkill.exe

description pid process

Token: SeDebugPrivilege 1096 taskkill.exe

pid	process
468	Purchase Order.pdf.exe
468	Purchase Order.pdf.exe
468	Purchase Order.pdf.exe

description	pid	process	target process
PID 1244 set thread context of 468	1244	Purchase Order.pdf.exe	Purchase Order.pdf.exe

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

pid	process
1096	taskkill.exe

description	pid	process
Token: SeDebugPrivilege	1096	taskkill.exe

Suspicious use of WriteProcessMemory 18 IoCs

Processes:

Purchase Order.pdf.exePurchase Order.pdf.execmd.exe

description	pid	process	target process
PID 1244 wrote to memory of 468	1244	Purchase Order.pdf.exe	Purchase Order.pdf.exe
PID 1244 wrote to memory of 468	1244	Purchase Order.pdf.exe	Purchase Order.pdf.exe
PID 1244 wrote to memory of 468	1244	Purchase Order.pdf.exe	Purchase Order.pdf.exe
PID 1244 wrote to memory of 468	1244	Purchase Order.pdf.exe	Purchase Order.pdf.exe
PID 1244 wrote to memory of 468	1244	Purchase Order.pdf.exe	Purchase Order.pdf.exe
PID 1244 wrote to memory of 468	1244	Purchase Order.pdf.exe	Purchase Order.pdf.exe
PID 1244 wrote to memory of 468	1244	Purchase Order.pdf.exe	Purchase Order.pdf.exe
PID 1244 wrote to memory of 468	1244	Purchase Order.pdf.exe	Purchase Order.pdf.exe
PID 1244 wrote to memory of 468	1244	Purchase Order.pdf.exe	Purchase Order.pdf.exe
PID 1244 wrote to memory of 468	1244	Purchase Order.pdf.exe	Purchase Order.pdf.exe
PID 468 wrote to memory of 2036	468	Purchase Order.pdf.exe	cmd.exe
PID 468 wrote to memory of 2036	468	Purchase Order.pdf.exe	cmd.exe
PID 468 wrote to memory of 2036	468	Purchase Order.pdf.exe	cmd.exe
PID 468 wrote to memory of 2036	468	Purchase Order.pdf.exe	cmd.exe
PID 2036 wrote to memory of 1096	2036	cmd.exe	taskkill.exe
PID 2036 wrote to memory of 1096	2036	cmd.exe	taskkill.exe
PID 2036 wrote to memory of 1096	2036	cmd.exe	taskkill.exe
PID 2036 wrote to memory of 1096	2036	cmd.exe	taskkill.exe

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:1244

C:\Users\Admin\AppData\Local\Temp\Purchase Order.pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Purchase Order.pdf.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:468

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 468 & erase C:\Users\Admin\AppData\Local\Temp\Purchase Order.pdf.exe & RD /S /Q C:\\ProgramData\\490178063334068\\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:2036

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 468
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1096

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/468-67-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/468-70-0x000000000040717B-mapping.dmp

Download
memory/468-79-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/468-60-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/468-61-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/468-63-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/468-65-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/468-74-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/468-69-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/468-72-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1096-80-0x0000000000000000-mapping.dmp

Download
memory/1244-58-0x0000000005040000-0x00000000050D2000-memory.dmp

Filesize
584KB

Download
memory/1244-54-0x0000000000880000-0x0000000000994000-memory.dmp

Filesize
1.1MB

Download
memory/1244-57-0x0000000000560000-0x000000000056C000-memory.dmp

Filesize
48KB

Download
memory/1244-56-0x00000000005F0000-0x0000000000608000-memory.dmp

Filesize
96KB

Download
memory/1244-55-0x00000000752B1000-0x00000000752B3000-memory.dmp

Filesize
8KB

Download
memory/1244-59-0x00000000006E0000-0x0000000000718000-memory.dmp

Filesize
224KB

Download
memory/2036-78-0x0000000000000000-mapping.dmp

Download

Analysis

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