oski | f1d9c87c7e97db85d31c56b62f33ae71a2869281cf054a1b4f1ce0d891e84f44

Analysis

max time kernel
84s
max time network
86s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
06-01-2023 09:03

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General

Target

Zoom_Commercial_setup.exe
Size

550KB
MD5

b7af9364e54e733684f2b5ef4bdd550a
SHA1

0b4a2b89d5373e6e13395753786154e90e803387
SHA256

37e06231dbbfd682fed877eece815fc8f383f05396495468805d75c94a802e6e
SHA512

15aafec28acb2862168ee073bd7dc7ea766463e677399f2d6da200f7db9a342c4e8db6f9237e12174fa4c99acf3d3279f686bb11e8a12adc53072492ef828c48
SSDEEP

6144:7nx1IH1z1RRu8HAx08JgSRxEguHjseJ1Rb/:shvRu8g3dbEjHjselb/

Score

10^/10

oski discovery infostealer persistence spyware stealer

Malware Config

Extracted

Family

oski

spamcxcs.com

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Downloads MZ/PE file
Executes dropped EXE 2 IoCs

Processes:

_gpj.ScrLocalHCjYfqYEpl.exe

pid process

4808 _gpj.Scr
3164 LocalHCjYfqYEpl.exe

pid	process
4808	_gpj.Scr
3164	LocalHCjYfqYEpl.exe

Checks computer location settings 2 TTPs 4 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

RegAsm.exeLocalHCjYfqYEpl.exeZoom_Commercial_setup.exe_gpj.Scr

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	RegAsm.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	LocalHCjYfqYEpl.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	Zoom_Commercial_setup.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	_gpj.Scr

Loads dropped DLL 3 IoCs

Processes:

LocalHCjYfqYEpl.exe

pid process

3164 LocalHCjYfqYEpl.exe
3164 LocalHCjYfqYEpl.exe
3164 LocalHCjYfqYEpl.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

pid	process
3164	LocalHCjYfqYEpl.exe
3164	LocalHCjYfqYEpl.exe
3164	LocalHCjYfqYEpl.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

_gpj.Scr

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\DriverHelp = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\DriverHelp.exe\""	_gpj.Scr

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:

_gpj.Scr

description pid process target process

PID 4808 set thread context of 1404 4808 _gpj.Scr 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:

LocalHCjYfqYEpl.exe

description ioc process

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

Processes:

taskkill.exe

pid process

1692 taskkill.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

powershell.exepowershell.exe

pid process

3952 powershell.exe
3952 powershell.exe
4496 powershell.exe
4496 powershell.exe

description	pid	process	target process
PID 4808 set thread context of 1404	4808	_gpj.Scr	RegAsm.exe

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

pid	process
1692	taskkill.exe

pid	process
3952	powershell.exe
3952	powershell.exe
4496	powershell.exe
4496	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

_gpj.Scrpowershell.exepowershell.exetaskkill.exe

description	pid	process
Token: SeDebugPrivilege	4808	_gpj.Scr
Token: SeDebugPrivilege	3952	powershell.exe
Token: SeDebugPrivilege	4496	powershell.exe
Token: SeDebugPrivilege	1692	taskkill.exe

Suspicious use of WriteProcessMemory 29 IoCs

Processes:

Zoom_Commercial_setup.exe_gpj.Scrcmd.exeRegAsm.exeLocalHCjYfqYEpl.execmd.exe

description	pid	process	target process
PID 2492 wrote to memory of 4808	2492	Zoom_Commercial_setup.exe	_gpj.Scr
PID 2492 wrote to memory of 4808	2492	Zoom_Commercial_setup.exe	_gpj.Scr
PID 2492 wrote to memory of 4808	2492	Zoom_Commercial_setup.exe	_gpj.Scr
PID 4808 wrote to memory of 3952	4808	_gpj.Scr	powershell.exe
PID 4808 wrote to memory of 3952	4808	_gpj.Scr	powershell.exe
PID 4808 wrote to memory of 3952	4808	_gpj.Scr	powershell.exe
PID 4808 wrote to memory of 3740	4808	_gpj.Scr	cmd.exe
PID 4808 wrote to memory of 3740	4808	_gpj.Scr	cmd.exe
PID 4808 wrote to memory of 3740	4808	_gpj.Scr	cmd.exe
PID 3740 wrote to memory of 4496	3740	cmd.exe	powershell.exe
PID 3740 wrote to memory of 4496	3740	cmd.exe	powershell.exe
PID 3740 wrote to memory of 4496	3740	cmd.exe	powershell.exe
PID 4808 wrote to memory of 1404	4808	_gpj.Scr	RegAsm.exe
PID 4808 wrote to memory of 1404	4808	_gpj.Scr	RegAsm.exe
PID 4808 wrote to memory of 1404	4808	_gpj.Scr	RegAsm.exe
PID 4808 wrote to memory of 1404	4808	_gpj.Scr	RegAsm.exe
PID 4808 wrote to memory of 1404	4808	_gpj.Scr	RegAsm.exe
PID 4808 wrote to memory of 1404	4808	_gpj.Scr	RegAsm.exe
PID 4808 wrote to memory of 1404	4808	_gpj.Scr	RegAsm.exe
PID 4808 wrote to memory of 1404	4808	_gpj.Scr	RegAsm.exe
PID 1404 wrote to memory of 3164	1404	RegAsm.exe	LocalHCjYfqYEpl.exe
PID 1404 wrote to memory of 3164	1404	RegAsm.exe	LocalHCjYfqYEpl.exe
PID 1404 wrote to memory of 3164	1404	RegAsm.exe	LocalHCjYfqYEpl.exe
PID 3164 wrote to memory of 5072	3164	LocalHCjYfqYEpl.exe	cmd.exe
PID 3164 wrote to memory of 5072	3164	LocalHCjYfqYEpl.exe	cmd.exe
PID 3164 wrote to memory of 5072	3164	LocalHCjYfqYEpl.exe	cmd.exe
PID 5072 wrote to memory of 1692	5072	cmd.exe	taskkill.exe
PID 5072 wrote to memory of 1692	5072	cmd.exe	taskkill.exe
PID 5072 wrote to memory of 1692	5072	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\Zoom_Commercial_setup.exe
"C:\Users\Admin\AppData\Local\Temp\Zoom_Commercial_setup.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2492

C:\Users\Admin\AppData\Local\Temp\_gpj.Scr
"C:\Users\Admin\AppData\Local\Temp\_gpj.Scr" /S
2⤵
- Executes dropped EXE
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4808

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3952

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
3⤵
- Suspicious use of WriteProcessMemory
PID:3740

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4496

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
3⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1404

C:\Users\Admin\AppData\LocalHCjYfqYEpl.exe
"C:\Users\Admin\AppData\LocalHCjYfqYEpl.exe"
4⤵
- Executes dropped EXE
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:3164

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 3164 & erase C:\Users\Admin\AppData\LocalHCjYfqYEpl.exe & RD /S /Q C:\\ProgramData\\092514818218895\\* & exit
5⤵
- Suspicious use of WriteProcessMemory
PID:5072

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 3164
6⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1692

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\ProgramData\mozglue.dll
Filesize
133KB

MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
C:\ProgramData\nss3.dll
Filesize
1.2MB

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
C:\ProgramData\sqlite3.dll
Filesize
630KB

MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

Download Submit
C:\Users\Admin\AppData\LocalHCjYfqYEpl.exe
Filesize
200KB

MD5
1e16a944c7f1144d9027946dc6732405

SHA1
682308d4299bee2bcea003805c78da3ccb31612c

SHA256
64b157d9021d2489acf96a9db8b8fc9b117b17c1157d4b497dee7e81c3822c7d

SHA512
4588c0cb89d07f7a84654ac36d24f00dd2c7442c5f1c03869858e607085ff53347c9dadf9f55eec4e88ace83b440eb5a5f4b729b2d076bb58a84e5781c97c1dd

Download Submit
C:\Users\Admin\AppData\LocalHCjYfqYEpl.exe
Filesize
200KB

MD5
1e16a944c7f1144d9027946dc6732405

SHA1
682308d4299bee2bcea003805c78da3ccb31612c

SHA256
64b157d9021d2489acf96a9db8b8fc9b117b17c1157d4b497dee7e81c3822c7d

SHA512
4588c0cb89d07f7a84654ac36d24f00dd2c7442c5f1c03869858e607085ff53347c9dadf9f55eec4e88ace83b440eb5a5f4b729b2d076bb58a84e5781c97c1dd

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
Filesize
1KB

MD5
4280e36a29fa31c01e4d8b2ba726a0d8

SHA1
c485c2c9ce0a99747b18d899b71dfa9a64dabe32

SHA256
e2486a1bdcba80dad6dd6210d7374bd70ae196a523c06ceda71370fd3ea78359

SHA512
494fe5f0ade03669e5830bed93c964d69b86629440148d7b0881cf53203fd89443ebff9b4d1ee9d96244f62af6edede622d9eacba37f80f389a0d522e4ad4ea4

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache
Filesize
53KB

MD5
06ad34f9739c5159b4d92d702545bd49

SHA1
9152a0d4f153f3f40f7e606be75f81b582ee0c17

SHA256
474813b625f00710f29fa3b488235a6a22201851efb336bddf60d7d24a66bfba

SHA512
c272cd28ae164d465b779163ba9eca6a28261376414c6bbdfbd9f2128adb7f7ff1420e536b4d6000d0301ded2ec9036bc5c657588458bff41f176bdce8d74f92

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Filesize
16KB

MD5
66e5c69d172c227d4d0435fd8c9664a4

SHA1
86dc25dd79c9394e41d373b7eacc2a06c782bb64

SHA256
33b009bda8bbe8d4141db351ee3555a4302ad9ff407300454d7244f99f4e2441

SHA512
0f7da5282f134824686597ceb47275b4c87d50c8631375849fc1890ace4e29635a83fed561c87c2c453266f99ce23e82af55d3210ad95f308218aee01ea861c7

Download Submit
C:\Users\Admin\AppData\Local\Temp\_gpj.Scr
Filesize
350.0MB

MD5
d53d10043ba87eeed33d98d04e3d7520

SHA1
d18c487cca17fbe2b58530bedd7d5fa0665c4def

SHA256
1300c6ff5d21a761a13fec4954a2c86cc64ae07d510c9cf53af377a61597da9a

SHA512
359673bbe112456621eae9068ec6dabf346609eab68356bfa06a93192a31404bef3e0f86dd1296929d5d5e59bb8bb93dda4c19747697ed9b4dc6f0791f5dec3b

Download Submit
C:\Users\Admin\AppData\Local\Temp\_gpj.Scr
Filesize
350.0MB

MD5
d53d10043ba87eeed33d98d04e3d7520

SHA1
d18c487cca17fbe2b58530bedd7d5fa0665c4def

SHA256
1300c6ff5d21a761a13fec4954a2c86cc64ae07d510c9cf53af377a61597da9a

SHA512
359673bbe112456621eae9068ec6dabf346609eab68356bfa06a93192a31404bef3e0f86dd1296929d5d5e59bb8bb93dda4c19747697ed9b4dc6f0791f5dec3b

Download Submit
memory/1404-152-0x0000000000000000-mapping.dmp

Download
memory/1404-153-0x0000000000400000-0x0000000000466000-memory.dmp

Filesize
408KB

Download
memory/1692-170-0x0000000000000000-mapping.dmp

Download
memory/3164-155-0x0000000000000000-mapping.dmp

Download
memory/3740-148-0x0000000000000000-mapping.dmp

Download
memory/3952-141-0x00000000029C0000-0x00000000029F6000-memory.dmp

Filesize
216KB

Download
memory/3952-140-0x0000000000000000-mapping.dmp

Download
memory/3952-147-0x0000000006520000-0x000000000653A000-memory.dmp

Filesize
104KB

Download
memory/3952-146-0x00000000076F0000-0x0000000007D6A000-memory.dmp

Filesize
6.5MB

Download
memory/3952-145-0x0000000006020000-0x000000000603E000-memory.dmp

Filesize
120KB

Download
memory/3952-144-0x00000000059A0000-0x0000000005A06000-memory.dmp

Filesize
408KB

Download
memory/3952-143-0x00000000050F0000-0x0000000005156000-memory.dmp

Filesize
408KB

Download
memory/3952-142-0x0000000005200000-0x0000000005828000-memory.dmp

Filesize
6.2MB

Download
memory/4496-163-0x0000000005890000-0x000000000589E000-memory.dmp

Filesize
56KB

Download
memory/4496-162-0x0000000007080000-0x0000000007116000-memory.dmp

Filesize
600KB

Download
memory/4496-158-0x0000000006BD0000-0x0000000006C02000-memory.dmp

Filesize
200KB

Download
memory/4496-165-0x0000000006FE0000-0x0000000006FE8000-memory.dmp

Filesize
32KB

Download
memory/4496-159-0x000000006EC80000-0x000000006ECCC000-memory.dmp

Filesize
304KB

Download
memory/4496-160-0x0000000005FD0000-0x0000000005FEE000-memory.dmp

Filesize
120KB

Download
memory/4496-161-0x0000000006E40000-0x0000000006E4A000-memory.dmp

Filesize
40KB

Download
memory/4496-164-0x0000000007000000-0x000000000701A000-memory.dmp

Filesize
104KB

Download
memory/4496-149-0x0000000000000000-mapping.dmp

Download
memory/4808-132-0x0000000000000000-mapping.dmp

Download
memory/4808-139-0x0000000008450000-0x0000000008472000-memory.dmp

Filesize
136KB

Download
memory/4808-138-0x0000000005120000-0x000000000512A000-memory.dmp

Filesize
40KB

Download
memory/4808-137-0x0000000004F90000-0x0000000005022000-memory.dmp

Filesize
584KB

Download
memory/4808-136-0x00000000054A0000-0x0000000005A44000-memory.dmp

Filesize
5.6MB

Download
memory/4808-135-0x00000000006F0000-0x00000000006F8000-memory.dmp

Filesize
32KB

Download
memory/5072-169-0x0000000000000000-mapping.dmp

Download