isrstealer | 92b34be60a42846ab40a9c84ec2fba72088e2a725ff612717081b405cdb915eb

Analysis

max time kernel
188s
max time network
193s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
23-11-2022 22:21

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General

Target

92b34be60a42846ab40a9c84ec2fba72088e2a725ff612717081b405cdb915eb.exe
Size

895KB
MD5

5be41d78bc950b8383bfeda8c29c8e21
SHA1

351984bd05bbfff6bc64edf972102f893f97ca11
SHA256

92b34be60a42846ab40a9c84ec2fba72088e2a725ff612717081b405cdb915eb
SHA512

474f3508fcb3efbc68fb832d3b806051916d9152f24aca882b6e9053a2954ed79645e27db1109d06ac42208f414daeb8fe8e3696bafa82adb2a68bfe04b2083f
SSDEEP

24576:UHZxEgbSj4Wm5v3IJneMGg6MlXjM9qB9so0fEZTZDQIFo:U5OqQ2v3unlVlA9M9sobQIF

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 4 IoCs

resource	yara_rule
behavioral2/memory/4032-139-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4032-147-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4032-157-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4032-165-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/2248-163-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/2248-164-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/2248-166-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral2/memory/2248-163-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/2248-164-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/2248-166-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 4 IoCs

pid	Process
3752	LbFot.exe
4032	cvtres.exe
4528	cvtres.exe
2248	cvtres.exe

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4528-149-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4528-152-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4528-153-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4528-154-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4528-155-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2248-159-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2248-162-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2248-163-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2248-164-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2248-166-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4060001867-1434967833-2212371794-1000\Control Panel\International\Geo\Nation	92b34be60a42846ab40a9c84ec2fba72088e2a725ff612717081b405cdb915eb.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 Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4060001867-1434967833-2212371794-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	cvtres.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3752 set thread context of 4032	3752	LbFot.exe	83
PID 4032 set thread context of 4528	4032	cvtres.exe	84
PID 4032 set thread context of 2248	4032	cvtres.exe	93

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 2 IoCs

pid	Process
3752	LbFot.exe
3752	LbFot.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3752	LbFot.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4032	cvtres.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 4924 wrote to memory of 3752	4924	92b34be60a42846ab40a9c84ec2fba72088e2a725ff612717081b405cdb915eb.exe	82
PID 4924 wrote to memory of 3752	4924	92b34be60a42846ab40a9c84ec2fba72088e2a725ff612717081b405cdb915eb.exe	82
PID 4924 wrote to memory of 3752	4924	92b34be60a42846ab40a9c84ec2fba72088e2a725ff612717081b405cdb915eb.exe	82
PID 3752 wrote to memory of 4032	3752	LbFot.exe	83
PID 3752 wrote to memory of 4032	3752	LbFot.exe	83
PID 3752 wrote to memory of 4032	3752	LbFot.exe	83
PID 3752 wrote to memory of 4032	3752	LbFot.exe	83
PID 3752 wrote to memory of 4032	3752	LbFot.exe	83
PID 3752 wrote to memory of 4032	3752	LbFot.exe	83
PID 3752 wrote to memory of 4032	3752	LbFot.exe	83
PID 3752 wrote to memory of 4032	3752	LbFot.exe	83
PID 4032 wrote to memory of 4528	4032	cvtres.exe	84
PID 4032 wrote to memory of 4528	4032	cvtres.exe	84
PID 4032 wrote to memory of 4528	4032	cvtres.exe	84
PID 4032 wrote to memory of 4528	4032	cvtres.exe	84
PID 4032 wrote to memory of 4528	4032	cvtres.exe	84
PID 4032 wrote to memory of 4528	4032	cvtres.exe	84
PID 4032 wrote to memory of 4528	4032	cvtres.exe	84
PID 4032 wrote to memory of 4528	4032	cvtres.exe	84
PID 4032 wrote to memory of 2248	4032	cvtres.exe	93
PID 4032 wrote to memory of 2248	4032	cvtres.exe	93
PID 4032 wrote to memory of 2248	4032	cvtres.exe	93
PID 4032 wrote to memory of 2248	4032	cvtres.exe	93
PID 4032 wrote to memory of 2248	4032	cvtres.exe	93
PID 4032 wrote to memory of 2248	4032	cvtres.exe	93
PID 4032 wrote to memory of 2248	4032	cvtres.exe	93
PID 4032 wrote to memory of 2248	4032	cvtres.exe	93

C:\Users\Admin\AppData\Local\Temp\92b34be60a42846ab40a9c84ec2fba72088e2a725ff612717081b405cdb915eb.exe
"C:\Users\Admin\AppData\Local\Temp\92b34be60a42846ab40a9c84ec2fba72088e2a725ff612717081b405cdb915eb.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4924
- C:\Users\Admin\AppData\Local\Temp\LbFot.exe
  "C:\Users\Admin\AppData\Local\Temp\LbFot.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3752
- - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
    C:\Users\Admin\AppData\Local\Temp\\cvtres.exe
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4032
  - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\3DsuZCbzij.ini"
      4⤵
      Executes dropped EXE
      PID:4528
  - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\fDzKXesTyx.ini"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      PID:2248

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

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

C:\Users\Admin\AppData\Local\Temp\3DsuZCbzij.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\LbFot.exe

Filesize
362KB

MD5
67175970a667f549a06d45acc00f5dc3

SHA1
4343db31ba556af655ac682e11b752fe1c032f8c

SHA256
f6e87d453d4c6554a17beff592eaebe163b5e035763eaf0fb6e922f88ae41410

SHA512
14e4028c4a3c12b4ee7d497a973b1a1f22f56b83462e74db3e530e40e65b94dbc155ef1d08a3949e007381c7716df8177760721a3f761feda3c498201b773350

Download Submit
C:\Users\Admin\AppData\Local\Temp\LbFot.exe

Filesize
362KB

MD5
67175970a667f549a06d45acc00f5dc3

SHA1
4343db31ba556af655ac682e11b752fe1c032f8c

SHA256
f6e87d453d4c6554a17beff592eaebe163b5e035763eaf0fb6e922f88ae41410

SHA512
14e4028c4a3c12b4ee7d497a973b1a1f22f56b83462e74db3e530e40e65b94dbc155ef1d08a3949e007381c7716df8177760721a3f761feda3c498201b773350

Download Submit
C:\Users\Admin\AppData\Local\Temp\cvtres.exe

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
C:\Users\Admin\AppData\Local\Temp\cvtres.exe

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
C:\Users\Admin\AppData\Local\Temp\cvtres.exe

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
C:\Users\Admin\AppData\Local\Temp\cvtres.exe

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
memory/2248-164-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2248-163-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2248-162-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2248-166-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2248-159-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3752-143-0x0000000074910000-0x0000000074EC1000-memory.dmp

Filesize
5.7MB

Download
memory/3752-145-0x0000000074910000-0x0000000074EC1000-memory.dmp

Filesize
5.7MB

Download
memory/4032-157-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4032-147-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4032-165-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4032-139-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4528-152-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4528-149-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4528-153-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4528-155-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4528-154-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4924-132-0x0000000074910000-0x0000000074EC1000-memory.dmp

Filesize
5.7MB

Download
memory/4924-137-0x0000000074910000-0x0000000074EC1000-memory.dmp

Filesize
5.7MB

Download
memory/4924-133-0x0000000074910000-0x0000000074EC1000-memory.dmp

Filesize
5.7MB

Download