oski | a3ef4500e9f5f2447d55de102e2529a62b48f644b03d22199ce5c69c0ca57c88

General

Target

proforma invoice No. 42037,pdf.exe
Size

31KB
MD5

1fc85b87347785b556af1d0f47a1f928
SHA1

c39c80b549f7dc46bfe18d5b956a4a17b28bac78
SHA256

a3ef4500e9f5f2447d55de102e2529a62b48f644b03d22199ce5c69c0ca57c88
SHA512

2c13b8f8e8845ed9ad2c5718a1fdbe16da06106b54cca04d8f978c0d15c1af8e90b900900e4b1c325e995ef5799101eee9edc182fc17c92dc33ecab478ac490c

Score

10^/10

oski snakekeylogger discovery infostealer keylogger spyware stealer

Malware Config

Extracted

Family

oski

C2

203.159.80.72

Extracted

Family

snakekeylogger

C2

https://api.telegram.org/bot1761516426:AAE3Juu_v6fG9Gy1S33LdTvyz85ua-duZsk/sendMessage?chat_id=1727399585

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Snake Keylogger
Keylogger and Infostealer first seen in November 2020.
stealer keylogger snakekeylogger

Snake Keylogger Payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1340-134-0x0000000000400000-0x000000000046A000-memory.dmp	family_snakekeylogger
behavioral2/memory/1340-135-0x000000000046446E-mapping.dmp	family_snakekeylogger

Downloads MZ/PE file
Executes dropped EXE 2 IoCs

Processes:

378281222364.exe378281222364.exe

pid process

3300 378281222364.exe
1340 378281222364.exe
Loads dropped DLL 3 IoCs

Processes:

proforma invoice No. 42037,pdf.exe

pid process

3044 proforma invoice No. 42037,pdf.exe
3044 proforma invoice No. 42037,pdf.exe
3044 proforma invoice No. 42037,pdf.exe
Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
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
Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

21 checkip.dyndns.org
24 freegeoip.app
25 freegeoip.app

pid	process
3300	378281222364.exe
1340	378281222364.exe

pid	process
3044	proforma invoice No. 42037,pdf.exe
3044	proforma invoice No. 42037,pdf.exe
3044	proforma invoice No. 42037,pdf.exe

flow	ioc
21	checkip.dyndns.org
24	freegeoip.app
25	freegeoip.app

Suspicious use of SetThreadContext 2 IoCs

Processes:

proforma invoice No. 42037,pdf.exe378281222364.exe

description	pid	process	target process
PID 2016 set thread context of 3044	2016	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 3300 set thread context of 1340	3300	378281222364.exe	378281222364.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:

proforma invoice No. 42037,pdf.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	proforma invoice No. 42037,pdf.exe

Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1736 taskkill.exe
NTFS ADS 1 IoCs

Processes:

proforma invoice No. 42037,pdf.exe

description ioc process

File created C:\ProgramData\378281222364.exe:Zone.Identifier proforma invoice No. 42037,pdf.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

378281222364.exe

pid process

1340 378281222364.exe

pid	process
1736	taskkill.exe

description	ioc	process
File created	C:\ProgramData\378281222364.exe:Zone.Identifier	proforma invoice No. 42037,pdf.exe

pid	process
1340	378281222364.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

proforma invoice No. 42037,pdf.exe378281222364.exe378281222364.exetaskkill.exe

description	pid	process
Token: SeDebugPrivilege	2016	proforma invoice No. 42037,pdf.exe
Token: SeDebugPrivilege	3300	378281222364.exe
Token: SeDebugPrivilege	1340	378281222364.exe
Token: SeDebugPrivilege	1736	taskkill.exe

Suspicious use of WriteProcessMemory 26 IoCs

Processes:

proforma invoice No. 42037,pdf.exeproforma invoice No. 42037,pdf.exe378281222364.execmd.exe

description	pid	process	target process
PID 2016 wrote to memory of 3044	2016	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 2016 wrote to memory of 3044	2016	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 2016 wrote to memory of 3044	2016	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 2016 wrote to memory of 3044	2016	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 2016 wrote to memory of 3044	2016	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 2016 wrote to memory of 3044	2016	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 2016 wrote to memory of 3044	2016	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 2016 wrote to memory of 3044	2016	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 2016 wrote to memory of 3044	2016	proforma invoice No. 42037,pdf.exe	proforma invoice No. 42037,pdf.exe
PID 3044 wrote to memory of 3300	3044	proforma invoice No. 42037,pdf.exe	378281222364.exe
PID 3044 wrote to memory of 3300	3044	proforma invoice No. 42037,pdf.exe	378281222364.exe
PID 3044 wrote to memory of 3300	3044	proforma invoice No. 42037,pdf.exe	378281222364.exe
PID 3300 wrote to memory of 1340	3300	378281222364.exe	378281222364.exe
PID 3300 wrote to memory of 1340	3300	378281222364.exe	378281222364.exe
PID 3300 wrote to memory of 1340	3300	378281222364.exe	378281222364.exe
PID 3300 wrote to memory of 1340	3300	378281222364.exe	378281222364.exe
PID 3300 wrote to memory of 1340	3300	378281222364.exe	378281222364.exe
PID 3300 wrote to memory of 1340	3300	378281222364.exe	378281222364.exe
PID 3300 wrote to memory of 1340	3300	378281222364.exe	378281222364.exe
PID 3300 wrote to memory of 1340	3300	378281222364.exe	378281222364.exe
PID 3044 wrote to memory of 1168	3044	proforma invoice No. 42037,pdf.exe	cmd.exe
PID 3044 wrote to memory of 1168	3044	proforma invoice No. 42037,pdf.exe	cmd.exe
PID 3044 wrote to memory of 1168	3044	proforma invoice No. 42037,pdf.exe	cmd.exe
PID 1168 wrote to memory of 1736	1168	cmd.exe	taskkill.exe
PID 1168 wrote to memory of 1736	1168	cmd.exe	taskkill.exe
PID 1168 wrote to memory of 1736	1168	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\proforma invoice No. 42037,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\proforma invoice No. 42037,pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2016

C:\Users\Admin\AppData\Local\Temp\proforma invoice No. 42037,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\proforma invoice No. 42037,pdf.exe"
2⤵
- Loads dropped DLL
- Checks processor information in registry
- NTFS ADS
- Suspicious use of WriteProcessMemory
PID:3044

C:\ProgramData\378281222364.exe
"C:\ProgramData\378281222364.exe"
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3300

C:\ProgramData\378281222364.exe
"C:\ProgramData\378281222364.exe"
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1340

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 3044 & erase C:\Users\Admin\AppData\Local\Temp\proforma invoice No. 42037,pdf.exe & RD /S /Q C:\\ProgramData\\555490934604716\\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:1168

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 3044
4⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1736

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

4

T1081

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

4

T1005

Exfiltration

Command and Control

Impact

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Downloads

C:\ProgramData\378281222364.exe
MD5
ac0829f5ca89f48cfeab1868c40f763a

SHA1
09acf3a61a16b0c75ba3670b5349e27eccd55e95

SHA256
1e4a969fd5191552a6dc7fb74d0ac4c1d06ed08e3c80440ca02c934857eb6f1e

SHA512
ab58a276b33d646842cb0666b609ad3852007b97e9bbf3ec2a6f81217f350c3d0e788fa60f2ddc23d7495963429e473f9f40d8e0388e4234ba9330a10cc2d8ee

Download Submit
C:\ProgramData\378281222364.exe
MD5
ac0829f5ca89f48cfeab1868c40f763a

SHA1
09acf3a61a16b0c75ba3670b5349e27eccd55e95

SHA256
1e4a969fd5191552a6dc7fb74d0ac4c1d06ed08e3c80440ca02c934857eb6f1e

SHA512
ab58a276b33d646842cb0666b609ad3852007b97e9bbf3ec2a6f81217f350c3d0e788fa60f2ddc23d7495963429e473f9f40d8e0388e4234ba9330a10cc2d8ee

Download Submit
C:\ProgramData\378281222364.exe
MD5
ac0829f5ca89f48cfeab1868c40f763a

SHA1
09acf3a61a16b0c75ba3670b5349e27eccd55e95

SHA256
1e4a969fd5191552a6dc7fb74d0ac4c1d06ed08e3c80440ca02c934857eb6f1e

SHA512
ab58a276b33d646842cb0666b609ad3852007b97e9bbf3ec2a6f81217f350c3d0e788fa60f2ddc23d7495963429e473f9f40d8e0388e4234ba9330a10cc2d8ee

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCookies\FO3XCBV6.cookie
MD5
ca57fb20fb41a5d45a09c0dd6439178f

SHA1
00d1c80422d82ad35dbf4da19ac0efc71e3cbe57

SHA256
7ae8ecf6849049a9adb9e1a72335b7ab72938d8d44ddf28e3196f380207014bc

SHA512
cfee96241ed962434f5a54f22ecc95a4874b5d685bb29286c5ecb5e2b2b8c05217e2f131cea6e7f234f977c833c422cb9214295f0a0113f1034609a9c19501a6

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/1168-137-0x0000000000000000-mapping.dmp

Download
memory/1340-146-0x0000000006A70000-0x0000000006A71000-memory.dmp

Filesize
4KB

Download
memory/1340-134-0x0000000000400000-0x000000000046A000-memory.dmp

Filesize
424KB

Download
memory/1340-147-0x0000000006C40000-0x0000000006C41000-memory.dmp

Filesize
4KB

Download
memory/1340-144-0x0000000005820000-0x0000000005D1E000-memory.dmp

Filesize
5.0MB

Download
memory/1340-148-0x0000000006D00000-0x0000000006D01000-memory.dmp

Filesize
4KB

Download
memory/1340-135-0x000000000046446E-mapping.dmp

Download
memory/1736-141-0x0000000000000000-mapping.dmp

Download
memory/2016-118-0x0000000005A00000-0x0000000005A01000-memory.dmp

Filesize
4KB

Download
memory/2016-114-0x0000000000130000-0x0000000000131000-memory.dmp

Filesize
4KB

Download
memory/2016-116-0x0000000004FB0000-0x0000000004FB1000-memory.dmp

Filesize
4KB

Download
memory/2016-121-0x0000000004A70000-0x0000000004A71000-memory.dmp

Filesize
4KB

Download
memory/2016-117-0x0000000005930000-0x0000000005951000-memory.dmp

Filesize
132KB

Download
memory/3044-120-0x000000000040717B-mapping.dmp

Download
memory/3044-122-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3044-119-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3300-129-0x00000000001A0000-0x00000000001A1000-memory.dmp

Filesize
4KB

Download
memory/3300-143-0x0000000004960000-0x0000000004E5E000-memory.dmp

Filesize
5.0MB

Download
memory/3300-126-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads