oski | 90cfb42d8415b2804d7335d4e9ddda33264906b0169dd121ccc80bd50643d0e2

General

Target

90cfb42d8415b2804d7335d4e9ddda33264906b0169dd121ccc80bd50643d0e2.exe
Size

432KB
MD5

566e00ed92162e1941567623e9938067
SHA1

3e285319ece4b35b877dd60a920d8970d87ed3fd
SHA256

90cfb42d8415b2804d7335d4e9ddda33264906b0169dd121ccc80bd50643d0e2
SHA512

7d96e0aea8302506713613ed68a55cea2ec0f1e4cd64ba6ff424bd772c621a6ad9136da2ec9c1f80b41c4267f7bd2ace82923f2ae2221010568f1e5de63fceaa
SSDEEP

6144:K2nLfyfKQu8zZ0zQ7Cn7ggrw5vK/cKomvWzMlTRay9VAHPpczK3qKTmZrqBMdGGF:K2nLYpzZUMKNHompdBwcKJurqBpJXAAu

Score

10^/10

oski evasion infostealer spyware stealer themida trojan upx

Malware Config

Extracted

Family

oski

C2

Fragly.top

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Processes:

os.exe

description ioc process

Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ os.exe
Downloads MZ/PE file

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	os.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

os.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	os.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	os.exe

Executes dropped EXE 2 IoCs

Processes:

winrar-x64.exe.exeos.exe

pid process

1608 winrar-x64.exe.exe
412 os.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

pid	process
1608	winrar-x64.exe.exe
412	os.exe

Themida packer 12 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\os.exe	themida
C:\Users\Admin\AppData\Roaming\os.exe	themida
behavioral2/memory/412-167-0x0000000000B90000-0x0000000001023000-memory.dmp	themida
behavioral2/memory/412-168-0x0000000000B90000-0x0000000001023000-memory.dmp	themida
behavioral2/memory/412-169-0x0000000000B90000-0x0000000001023000-memory.dmp	themida
behavioral2/memory/412-172-0x0000000000B90000-0x0000000001023000-memory.dmp	themida
behavioral2/memory/412-173-0x0000000000B90000-0x0000000001023000-memory.dmp	themida
behavioral2/memory/412-174-0x0000000000B90000-0x0000000001023000-memory.dmp	themida
behavioral2/memory/412-175-0x0000000000B90000-0x0000000001023000-memory.dmp	themida
behavioral2/memory/412-176-0x0000000000B90000-0x0000000001023000-memory.dmp	themida
behavioral2/memory/412-177-0x0000000000B90000-0x0000000001023000-memory.dmp	themida
behavioral2/memory/412-180-0x0000000000B90000-0x0000000001023000-memory.dmp	themida

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral2/memory/772-133-0x0000000000400000-0x00000000004FF000-memory.dmp	upx
behavioral2/memory/772-138-0x0000000000400000-0x00000000004FF000-memory.dmp	upx
behavioral2/memory/772-166-0x0000000000400000-0x00000000004FF000-memory.dmp	upx
behavioral2/memory/772-170-0x0000000000400000-0x00000000004FF000-memory.dmp	upx

Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

os.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA os.exe
Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

os.exe

pid process

412 os.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

2628 412 WerFault.exe os.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

winrar-x64.exe.exe

pid process

1608 winrar-x64.exe.exe
1608 winrar-x64.exe.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	os.exe

pid	process
412	os.exe

pid	pid_target	process	target process
2628	412	WerFault.exe	os.exe

pid	process
1608	winrar-x64.exe.exe
1608	winrar-x64.exe.exe

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

90cfb42d8415b2804d7335d4e9ddda33264906b0169dd121ccc80bd50643d0e2.exe

description	pid	process	target process
PID 772 wrote to memory of 1608	772	90cfb42d8415b2804d7335d4e9ddda33264906b0169dd121ccc80bd50643d0e2.exe	winrar-x64.exe.exe
PID 772 wrote to memory of 1608	772	90cfb42d8415b2804d7335d4e9ddda33264906b0169dd121ccc80bd50643d0e2.exe	winrar-x64.exe.exe
PID 772 wrote to memory of 412	772	90cfb42d8415b2804d7335d4e9ddda33264906b0169dd121ccc80bd50643d0e2.exe	os.exe
PID 772 wrote to memory of 412	772	90cfb42d8415b2804d7335d4e9ddda33264906b0169dd121ccc80bd50643d0e2.exe	os.exe
PID 772 wrote to memory of 412	772	90cfb42d8415b2804d7335d4e9ddda33264906b0169dd121ccc80bd50643d0e2.exe	os.exe

C:\Users\Admin\AppData\Local\Temp\90cfb42d8415b2804d7335d4e9ddda33264906b0169dd121ccc80bd50643d0e2.exe
"C:\Users\Admin\AppData\Local\Temp\90cfb42d8415b2804d7335d4e9ddda33264906b0169dd121ccc80bd50643d0e2.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:772

C:\Users\Admin\AppData\Roaming\winrar-x64.exe.exe
C:\Users\Admin\AppData\Roaming\winrar-x64.exe.exe
2⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:1608

C:\Users\Admin\AppData\Roaming\os.exe
C:\Users\Admin\AppData\Roaming\os.exe
2⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Executes dropped EXE
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
PID:412

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 1340
3⤵
- Program crash
PID:2628

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 412 -ip 412
1⤵
PID:3188

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

2

T1012

Virtualization/Sandbox Evasion

1

T1497

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Web Service

1

T1102

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\os.exe
Filesize
4.3MB

MD5
b12b4cb2ca643b0b00ce042da30ea040

SHA1
68fa56f7a4f250e8cf140aeb9639141874e5203a

SHA256
8455d1d048cc087c33fc366aed0cd25d385ef33e5f5833c199ed9f390eb9238d

SHA512
efa44431a80c5a70c52a9b659a1f752a80f4ed71d93ea9a7a89e9b0cd7976f1fa7fa7bd71704901d60e885be6a6087af42eef49ff1b7a515a204de7d6951727a

Download Submit
C:\Users\Admin\AppData\Roaming\os.exe
Filesize
4.3MB

MD5
b12b4cb2ca643b0b00ce042da30ea040

SHA1
68fa56f7a4f250e8cf140aeb9639141874e5203a

SHA256
8455d1d048cc087c33fc366aed0cd25d385ef33e5f5833c199ed9f390eb9238d

SHA512
efa44431a80c5a70c52a9b659a1f752a80f4ed71d93ea9a7a89e9b0cd7976f1fa7fa7bd71704901d60e885be6a6087af42eef49ff1b7a515a204de7d6951727a

Download Submit
C:\Users\Admin\AppData\Roaming\winrar-x64.exe.exe
Filesize
3.1MB

MD5
61c12d7edaa1c467c8b2bdc028936da3

SHA1
8c12f3f143d71e9c07abdf54429992f059ae0bb0

SHA256
851e6ca4857a54b6481668d84438ef4209ebfad89b930b4e30898180728f5f57

SHA512
f3117767a2ae1aec191c07e9d3ded0b28aeebc44b0f31d34eb7d1dbe175e9492cc3354b9f87a8419348cc589b7983ae425d574bddf19e0ca0b78487d9891393a

Download Submit
C:\Users\Admin\AppData\Roaming\winrar-x64.exe.exe
Filesize
3.1MB

MD5
61c12d7edaa1c467c8b2bdc028936da3

SHA1
8c12f3f143d71e9c07abdf54429992f059ae0bb0

SHA256
851e6ca4857a54b6481668d84438ef4209ebfad89b930b4e30898180728f5f57

SHA512
f3117767a2ae1aec191c07e9d3ded0b28aeebc44b0f31d34eb7d1dbe175e9492cc3354b9f87a8419348cc589b7983ae425d574bddf19e0ca0b78487d9891393a

Download Submit
memory/412-169-0x0000000000B90000-0x0000000001023000-memory.dmp

Filesize
4.6MB

Download
memory/412-172-0x0000000000B90000-0x0000000001023000-memory.dmp

Filesize
4.6MB

Download
memory/412-180-0x0000000000B90000-0x0000000001023000-memory.dmp

Filesize
4.6MB

Download
memory/412-167-0x0000000000B90000-0x0000000001023000-memory.dmp

Filesize
4.6MB

Download
memory/412-168-0x0000000000B90000-0x0000000001023000-memory.dmp

Filesize
4.6MB

Download
memory/412-177-0x0000000000B90000-0x0000000001023000-memory.dmp

Filesize
4.6MB

Download
memory/412-176-0x0000000000B90000-0x0000000001023000-memory.dmp

Filesize
4.6MB

Download
memory/412-175-0x0000000000B90000-0x0000000001023000-memory.dmp

Filesize
4.6MB

Download
memory/412-173-0x0000000000B90000-0x0000000001023000-memory.dmp

Filesize
4.6MB

Download
memory/412-174-0x0000000000B90000-0x0000000001023000-memory.dmp

Filesize
4.6MB

Download
memory/772-138-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/772-133-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/772-170-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/772-166-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/1608-181-0x0000022429B50000-0x000002242B1C7000-memory.dmp

Filesize
22.5MB

Download
memory/1608-183-0x0000022429B50000-0x000002242B1C7000-memory.dmp

Filesize
22.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads