oski | 376c76d02aeb61b3e845c8ecf4f92bae4800e528cb2e30ec8285eecda31caa7b

General

Target

purchase order confirmation.exe
Size

869KB
MD5

b6193459ff2361eb953487e551324b5d
SHA1

6d078df1b2ceb48c70bf4a54d0145d74f0f74ddb
SHA256

376c76d02aeb61b3e845c8ecf4f92bae4800e528cb2e30ec8285eecda31caa7b
SHA512

8b1f1a170e607a5e918f1764dd1054d458be7c0acf498a6502080b4a9c22c4369721211e8af6bdd6dac290d358c9a9849a32258db6de2343e37714fdf25ff517

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

31.210.21.181

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Downloads MZ/PE file
Executes dropped EXE 1 IoCs

Processes:

188646154889.exe

pid process

3280 188646154889.exe
Loads dropped DLL 3 IoCs

Processes:

purchase order confirmation.exe

pid process

4080 purchase order confirmation.exe
4080 purchase order confirmation.exe
4080 purchase order confirmation.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 confirmation.exe

description pid process target process

PID 3172 set thread context of 4080 3172 purchase order confirmation.exe purchase order confirmation.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
3280	188646154889.exe

pid	process
4080	purchase order confirmation.exe
4080	purchase order confirmation.exe
4080	purchase order confirmation.exe

description	pid	process	target process
PID 3172 set thread context of 4080	3172	purchase order confirmation.exe	purchase order confirmation.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:

purchase order confirmation.exe

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

Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

2384 taskkill.exe
NTFS ADS 1 IoCs

Processes:

purchase order confirmation.exe

description ioc process

File created C:\ProgramData\188646154889.exe:Zone.Identifier purchase order confirmation.exe

pid	process
2384	taskkill.exe

description	ioc	process
File created	C:\ProgramData\188646154889.exe:Zone.Identifier	purchase order confirmation.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

purchase order confirmation.exe

pid	process
3172	purchase order confirmation.exe
3172	purchase order confirmation.exe
3172	purchase order confirmation.exe
3172	purchase order confirmation.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

purchase order confirmation.exetaskkill.exe

description pid process

Token: SeDebugPrivilege 3172 purchase order confirmation.exe
Token: SeDebugPrivilege 2384 taskkill.exe

description	pid	process
Token: SeDebugPrivilege	3172	purchase order confirmation.exe
Token: SeDebugPrivilege	2384	taskkill.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

purchase order confirmation.exepurchase order confirmation.execmd.exe

C:\Users\Admin\AppData\Local\Temp\purchase order confirmation.exe
"C:\Users\Admin\AppData\Local\Temp\purchase order confirmation.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3172

C:\Users\Admin\AppData\Local\Temp\purchase order confirmation.exe
"C:\Users\Admin\AppData\Local\Temp\purchase order confirmation.exe"
2⤵
PID:4068

C:\Users\Admin\AppData\Local\Temp\purchase order confirmation.exe
"C:\Users\Admin\AppData\Local\Temp\purchase order confirmation.exe"
2⤵
PID:3544

C:\Users\Admin\AppData\Local\Temp\purchase order confirmation.exe
"C:\Users\Admin\AppData\Local\Temp\purchase order confirmation.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- NTFS ADS
- Suspicious use of WriteProcessMemory
PID:4080

C:\ProgramData\188646154889.exe
"C:\ProgramData\188646154889.exe"
3⤵
- Executes dropped EXE
PID:3280

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 4080 & erase C:\Users\Admin\AppData\Local\Temp\purchase order confirmation.exe & RD /S /Q C:\\ProgramData\\135922471522985\\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:692

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 4080
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:2384

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

C:\ProgramData\188646154889.exe
MD5
0d50c8e7c3f044099056bfb318f108c6

SHA1
538871e91c9cac38af31bd09fe456843d841f586

SHA256
91f6fc2ae99e090dad56e53c7bf258dd4f43df79ac02a11f2620c31f045fc87f

SHA512
5364611735fe235a94a0339eae7511472eeab0b892e9e1a17da46f23802f82c4c2b225bed37953226a1b8b84d6711f16eee15f28254d5a4d68bc26e378b7c7ad

Download Submit
C:\ProgramData\188646154889.exe
MD5
0d50c8e7c3f044099056bfb318f108c6

SHA1
538871e91c9cac38af31bd09fe456843d841f586

SHA256
91f6fc2ae99e090dad56e53c7bf258dd4f43df79ac02a11f2620c31f045fc87f

SHA512
5364611735fe235a94a0339eae7511472eeab0b892e9e1a17da46f23802f82c4c2b225bed37953226a1b8b84d6711f16eee15f28254d5a4d68bc26e378b7c7ad

Download Submit
\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/692-141-0x0000000000000000-mapping.dmp

Download
memory/2384-143-0x0000000000000000-mapping.dmp

Download
memory/3172-120-0x0000000005450000-0x0000000005451000-memory.dmp

Filesize
4KB

Download
memory/3172-123-0x0000000001290000-0x000000000130A000-memory.dmp

Filesize
488KB

Download
memory/3172-124-0x00000000084E0000-0x000000000851B000-memory.dmp

Filesize
236KB

Download
memory/3172-116-0x00000000051B0000-0x00000000051B1000-memory.dmp

Filesize
4KB

Download
memory/3172-117-0x0000000005750000-0x0000000005751000-memory.dmp

Filesize
4KB

Download
memory/3172-118-0x00000000052F0000-0x00000000052F1000-memory.dmp

Filesize
4KB

Download
memory/3172-122-0x0000000005250000-0x000000000574E000-memory.dmp

Filesize
5.0MB

Download
memory/3172-121-0x00000000052E0000-0x00000000052EE000-memory.dmp

Filesize
56KB

Download
memory/3172-114-0x00000000008C0000-0x00000000008C1000-memory.dmp

Filesize
4KB

Download
memory/3172-119-0x0000000005250000-0x0000000005251000-memory.dmp

Filesize
4KB

Download
memory/3280-131-0x0000000000000000-mapping.dmp

Download
memory/3280-134-0x0000000000490000-0x0000000000491000-memory.dmp

Filesize
4KB

Download
memory/3280-144-0x0000000004E10000-0x000000000530E000-memory.dmp

Filesize
5.0MB

Download
memory/4080-127-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4080-126-0x000000000040717B-mapping.dmp

Download
memory/4080-125-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download

description	pid	process	target process
PID 3172 wrote to memory of 4068	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 4068	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 4068	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 3544	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 3544	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 3544	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 4080	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 4080	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 4080	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 4080	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 4080	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 4080	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 4080	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 4080	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 3172 wrote to memory of 4080	3172	purchase order confirmation.exe	purchase order confirmation.exe
PID 4080 wrote to memory of 3280	4080	purchase order confirmation.exe	188646154889.exe
PID 4080 wrote to memory of 3280	4080	purchase order confirmation.exe	188646154889.exe
PID 4080 wrote to memory of 3280	4080	purchase order confirmation.exe	188646154889.exe
PID 4080 wrote to memory of 692	4080	purchase order confirmation.exe	cmd.exe
PID 4080 wrote to memory of 692	4080	purchase order confirmation.exe	cmd.exe
PID 4080 wrote to memory of 692	4080	purchase order confirmation.exe	cmd.exe
PID 692 wrote to memory of 2384	692	cmd.exe	taskkill.exe
PID 692 wrote to memory of 2384	692	cmd.exe	taskkill.exe
PID 692 wrote to memory of 2384	692	cmd.exe	taskkill.exe

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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