oski | fae525089f850763e561a756f8378667c9ed081493ba9871847c83e0013a292d

Analysis

max time kernel
136s
max time network
139s
platform
windows7_x64
resource
win7-20220718-en
resource tags

arch:x64arch:x86image:win7-20220718-enlocale:en-usos:windows7-x64system
submitted
19/07/2022, 03:01

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General

Target
a2c723046a2c17a707b9637692fffb71.exe
Size 879KB
Sample220719-dhwp2agca3
SHA256 fae525089f850763e561a756f8378667c9ed081493ba9871847c83e0013a292d
MD5 a2c723046a2c17a707b9637692fffb71
SHA1 a6f9221de5a668581363fa8169bb7b1c138e33cb
SHA512 20caec409291ec011fb6b62101031ec05eb1a4f57486753ba406dcefb8ec6a32e5655e1d95cc48a27317a18627fbf5fd8fbc22daa2d61923444c3041c11b825a
MD5 SHA1 SHA512

Score

10^/10

oski infostealer

Malware Config

Extracted

Family

oski

masterwork.me

Signatures

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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1956 set thread context of 1304	1956	a2c723046a2c17a707b9637692fffb71.exe	32

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

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

pid	Process
2028	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
1956	a2c723046a2c17a707b9637692fffb71.exe
1956	a2c723046a2c17a707b9637692fffb71.exe
1956	a2c723046a2c17a707b9637692fffb71.exe
1956	a2c723046a2c17a707b9637692fffb71.exe
1956	a2c723046a2c17a707b9637692fffb71.exe
1956	a2c723046a2c17a707b9637692fffb71.exe
1956	a2c723046a2c17a707b9637692fffb71.exe
1956	a2c723046a2c17a707b9637692fffb71.exe
1256	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1956	a2c723046a2c17a707b9637692fffb71.exe
Token: SeDebugPrivilege	1256	powershell.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1956 wrote to memory of 1256	1956	a2c723046a2c17a707b9637692fffb71.exe	28
PID 1956 wrote to memory of 1256	1956	a2c723046a2c17a707b9637692fffb71.exe	28
PID 1956 wrote to memory of 1256	1956	a2c723046a2c17a707b9637692fffb71.exe	28
PID 1956 wrote to memory of 1256	1956	a2c723046a2c17a707b9637692fffb71.exe	28
PID 1956 wrote to memory of 2028	1956	a2c723046a2c17a707b9637692fffb71.exe	30
PID 1956 wrote to memory of 2028	1956	a2c723046a2c17a707b9637692fffb71.exe	30
PID 1956 wrote to memory of 2028	1956	a2c723046a2c17a707b9637692fffb71.exe	30
PID 1956 wrote to memory of 2028	1956	a2c723046a2c17a707b9637692fffb71.exe	30
PID 1956 wrote to memory of 1304	1956	a2c723046a2c17a707b9637692fffb71.exe	32
PID 1956 wrote to memory of 1304	1956	a2c723046a2c17a707b9637692fffb71.exe	32
PID 1956 wrote to memory of 1304	1956	a2c723046a2c17a707b9637692fffb71.exe	32
PID 1956 wrote to memory of 1304	1956	a2c723046a2c17a707b9637692fffb71.exe	32
PID 1956 wrote to memory of 1304	1956	a2c723046a2c17a707b9637692fffb71.exe	32
PID 1956 wrote to memory of 1304	1956	a2c723046a2c17a707b9637692fffb71.exe	32
PID 1956 wrote to memory of 1304	1956	a2c723046a2c17a707b9637692fffb71.exe	32
PID 1956 wrote to memory of 1304	1956	a2c723046a2c17a707b9637692fffb71.exe	32
PID 1956 wrote to memory of 1304	1956	a2c723046a2c17a707b9637692fffb71.exe	32
PID 1956 wrote to memory of 1304	1956	a2c723046a2c17a707b9637692fffb71.exe	32

C:\Users\Admin\AppData\Local\Temp\a2c723046a2c17a707b9637692fffb71.exe
"C:\Users\Admin\AppData\Local\Temp\a2c723046a2c17a707b9637692fffb71.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1956
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\UFpvpuHQeW.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1256
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\UFpvpuHQeW" /XML "C:\Users\Admin\AppData\Local\Temp\tmpC717.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:2028
- C:\Users\Admin\AppData\Local\Temp\a2c723046a2c17a707b9637692fffb71.exe
  "C:\Users\Admin\AppData\Local\Temp\a2c723046a2c17a707b9637692fffb71.exe"
  2⤵
  PID:1304

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmpC717.tmp

Path C:\Users\Admin\AppData\Local\Temp\tmpC717.tmp
Size 1KB
SHA256 168233e4cfdc385494226f668438ba68a99f448eb2b5ed7c8afb952ef94ac69c
MD5 ef2c2c7cd39906f54cf8ae4092587259
SHA1 b7e417690b7a2bccade36ebcfe50627673134737
SHA512 d3a8306e9b805d29f8236a165200a03c1455c3b7a079e399c42b413a6c52b14c1cf43a952f4a8028889d67a94c823c59570934f8a6096a2180f8ae95f0b16537
MD5 SHA1 SHA512

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memory/1256-81-0x000000006F090000-0x000000006F63B000-memory.dmp

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memory/1256-79-0x000000006F090000-0x000000006F63B000-memory.dmp

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memory/1304-74-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1304-77-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1304-80-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1304-72-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1304-70-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1304-65-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1304-66-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1304-68-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1956-64-0x0000000004FA0000-0x0000000004FD8000-memory.dmp

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memory/1956-56-0x00000000004C0000-0x00000000004D4000-memory.dmp

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memory/1956-54-0x0000000000C50000-0x0000000000D32000-memory.dmp

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memory/1956-59-0x0000000005F20000-0x0000000005F9E000-memory.dmp

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memory/1956-57-0x0000000000560000-0x0000000000574000-memory.dmp

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memory/1956-58-0x0000000000810000-0x000000000081E000-memory.dmp

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memory/1956-55-0x00000000756B1000-0x00000000756B3000-memory.dmp

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