isrstealer | fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1

Analysis

max time kernel
4294180s
max time network
143s
platform
windows7_x64
resource
win7-20220311-en
submitted
15-03-2022 13:55

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General

Target

fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe
Size

549KB
MD5

c0d8542ea3bac647aab1df09704498dd
SHA1

0003125e07acb64a613f29435c8a19ec4e8f2805
SHA256

fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1
SHA512

3f1090fe34694cf067d938288cf7e44d5222f92e4f33227ee18e58065e42b4bee91126340662b5647dc0679a8c7fd20973aadc5c24fc89be6b747a385c521e92

Score

10^/10

isrstealer collection spyware stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer Payload 2 IoCs

resource	yara_rule
behavioral1/memory/1668-60-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral1/memory/1668-62-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1136-116-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/1820-93-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral1/memory/1820-101-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

Nirsoft 4 IoCs

resource	yara_rule
behavioral1/memory/1820-93-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral1/memory/364-111-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral1/memory/1820-101-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral1/memory/1136-116-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 5 IoCs

pid	Process
1668	cvtres.exe
920	cvtres.exe
1820	cvtres.exe
364	cvtres.exe
1136	cvtres.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral1/memory/364-102-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral1/memory/364-108-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral1/memory/1136-110-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/364-111-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral1/memory/1136-115-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1136-116-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Loads dropped DLL 5 IoCs

pid	Process
1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe
1668	cvtres.exe
920	cvtres.exe
920	cvtres.exe
920	cvtres.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 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 Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2199625441-3471261906-229485034-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	cvtres.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 1620 set thread context of 1668	1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe	29
PID 1668 set thread context of 920	1668	cvtres.exe	30
PID 920 set thread context of 1820	920	cvtres.exe	31
PID 920 set thread context of 364	920	cvtres.exe	33
PID 920 set thread context of 1136	920	cvtres.exe	34

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1668	cvtres.exe
1668	cvtres.exe
1668	cvtres.exe
1668	cvtres.exe
1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe
1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe
Token: SeDebugPrivilege	364	cvtres.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1668	cvtres.exe

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 1620 wrote to memory of 1668	1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe	29
PID 1620 wrote to memory of 1668	1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe	29
PID 1620 wrote to memory of 1668	1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe	29
PID 1620 wrote to memory of 1668	1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe	29
PID 1620 wrote to memory of 1668	1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe	29
PID 1620 wrote to memory of 1668	1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe	29
PID 1620 wrote to memory of 1668	1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe	29
PID 1620 wrote to memory of 1668	1620	fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe	29
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 1668 wrote to memory of 920	1668	cvtres.exe	30
PID 920 wrote to memory of 1820	920	cvtres.exe	31
PID 920 wrote to memory of 1820	920	cvtres.exe	31
PID 920 wrote to memory of 1820	920	cvtres.exe	31
PID 920 wrote to memory of 1820	920	cvtres.exe	31
PID 920 wrote to memory of 1820	920	cvtres.exe	31
PID 920 wrote to memory of 1820	920	cvtres.exe	31
PID 920 wrote to memory of 364	920	cvtres.exe	33
PID 920 wrote to memory of 364	920	cvtres.exe	33
PID 920 wrote to memory of 364	920	cvtres.exe	33
PID 920 wrote to memory of 364	920	cvtres.exe	33
PID 920 wrote to memory of 364	920	cvtres.exe	33
PID 920 wrote to memory of 364	920	cvtres.exe	33
PID 920 wrote to memory of 1136	920	cvtres.exe	34
PID 920 wrote to memory of 1136	920	cvtres.exe	34
PID 920 wrote to memory of 1136	920	cvtres.exe	34
PID 920 wrote to memory of 1136	920	cvtres.exe	34
PID 920 wrote to memory of 1136	920	cvtres.exe	34
PID 920 wrote to memory of 1136	920	cvtres.exe	34

C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe
"C:\Users\Admin\AppData\Local\Temp\fb476e8cd10587ebb49487f1d95165fc1a3065038edcea30c725d9ad1ab015a1.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1620
- C:\Users\Admin\AppData\Local\Temp\cvtres.exe
  C:\Users\Admin\AppData\Local\Temp\\cvtres.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1668
- - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
    "C:\Users\Admin\AppData\Local\Temp\cvtres.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:920
  - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
      "C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp
      4⤵
      Executes dropped EXE
      PID:1820
  - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
      "C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data1.dmp
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      PID:364
  - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
      "C:\Users\Admin\AppData\Local\Temp\cvtres.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data2.dmp
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      PID:1136

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/364-111-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/364-98-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/364-102-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/364-108-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/920-73-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/920-81-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/920-83-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/920-85-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/920-87-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/920-79-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/920-71-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/920-69-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/920-75-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/920-77-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/1136-106-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1136-115-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1136-110-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1136-116-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1620-90-0x0000000074930000-0x0000000074EDB000-memory.dmp

Filesize
5.7MB

Download
memory/1620-54-0x0000000075471000-0x0000000075473000-memory.dmp

Filesize
8KB

Download
memory/1620-97-0x0000000074930000-0x0000000074EDB000-memory.dmp

Filesize
5.7MB

Download
memory/1620-92-0x0000000001F90000-0x0000000001F91000-memory.dmp

Filesize
4KB

Download
memory/1668-62-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1668-60-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1668-58-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1668-56-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1820-101-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/1820-93-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/1820-89-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download