isrstealer | 96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f

General

Target

96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe
Size

405KB
MD5

3a9ccc8c2e136158792d8f7fd20c88ef
SHA1

c8d1514ebefae81e891a87deb18402dad7808b19
SHA256

96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f
SHA512

54bdcff52ba044988ae5717b55866c167b29af3b24453b54aae1638ff5749948aa3f1e5c628e3e91cedb9cfc475d1a4c991230a07a3081998d95d047f05743c5
SSDEEP

12288:GdDlk4F3y0DTHY3DQn2T0uBVYrsHSFGZl3QWyThAc43Oww:GdDlk4F3yITHY3DQn2TdTASSkl3QWyTt

Score

10^/10

isrstealer collection 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/2500-134-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2500-145-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2500-147-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2500-154-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/544-152-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/544-153-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/544-152-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/544-153-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1484-140-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1484-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1484-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1484-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/544-149-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/544-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/544-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/544-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

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	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3296 set thread context of 2500	3296	96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe	83
PID 2500 set thread context of 1484	2500	vbc.exe	84
PID 2500 set thread context of 544	2500	vbc.exe	87

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3296	96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2500	vbc.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 3296 wrote to memory of 2500	3296	96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe	83
PID 3296 wrote to memory of 2500	3296	96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe	83
PID 3296 wrote to memory of 2500	3296	96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe	83
PID 3296 wrote to memory of 2500	3296	96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe	83
PID 3296 wrote to memory of 2500	3296	96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe	83
PID 3296 wrote to memory of 2500	3296	96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe	83
PID 3296 wrote to memory of 2500	3296	96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe	83
PID 2500 wrote to memory of 1484	2500	vbc.exe	84
PID 2500 wrote to memory of 1484	2500	vbc.exe	84
PID 2500 wrote to memory of 1484	2500	vbc.exe	84
PID 2500 wrote to memory of 1484	2500	vbc.exe	84
PID 2500 wrote to memory of 1484	2500	vbc.exe	84
PID 2500 wrote to memory of 1484	2500	vbc.exe	84
PID 2500 wrote to memory of 1484	2500	vbc.exe	84
PID 2500 wrote to memory of 1484	2500	vbc.exe	84
PID 2500 wrote to memory of 544	2500	vbc.exe	87
PID 2500 wrote to memory of 544	2500	vbc.exe	87
PID 2500 wrote to memory of 544	2500	vbc.exe	87
PID 2500 wrote to memory of 544	2500	vbc.exe	87
PID 2500 wrote to memory of 544	2500	vbc.exe	87
PID 2500 wrote to memory of 544	2500	vbc.exe	87
PID 2500 wrote to memory of 544	2500	vbc.exe	87
PID 2500 wrote to memory of 544	2500	vbc.exe	87

C:\Users\Admin\AppData\Local\Temp\96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe
"C:\Users\Admin\AppData\Local\Temp\96c3c4f9a3f44b9e143e5a21d6b23b1e57c899e3b24c8fdad00e307762fbc89f.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3296
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2500
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\F2JvMBVci7.ini"
    3⤵
    PID:1484
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\X2Ate0eR5Z.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:544

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\F2JvMBVci7.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/544-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/544-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/544-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/544-149-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1484-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1484-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1484-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1484-140-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2500-145-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2500-147-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2500-134-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2500-154-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3296-132-0x00000000745F0000-0x0000000074BA1000-memory.dmp

Filesize
5.7MB

Download
memory/3296-137-0x00000000745F0000-0x0000000074BA1000-memory.dmp

Filesize
5.7MB

Download

Analysis

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