isrstealer | 8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2

General

Target

8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe
Size

631KB
MD5

f6ec96e239dbf62d3676420474b1ca1f
SHA1

ca729d2a1805c7ba3a89d2e21a89834d3087ffd3
SHA256

8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2
SHA512

e539810418b39b38817b9e1222d7c07c97ab18c190f604ab9ccbcbd00cfe2671a515d85724124a27d7e0bd3133447adb7a291e0c263935759dcae7516f790781
SSDEEP

12288:xF6Lhd7O0+kLU1WECMbSBkfwIeEHDf8zQ3PeKb0kT+Bt6qg9UfdQJpJZKv:xF6V5OzkXkGazesDf8Q/eQ0kQNQJpJsv

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 6 IoCs

resource	yara_rule
behavioral1/memory/644-60-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/644-62-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/644-63-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/644-75-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/644-79-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/644-87-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1888-85-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1888-86-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/1888-85-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1888-86-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1700-68-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1700-72-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1700-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1700-74-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1700-76-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1888-80-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1888-84-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1888-85-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1888-86-0x0000000000400000-0x000000000041F000-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-1-5-21-575491160-2295418218-1540667289-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1348 set thread context of 644	1348	8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe	28
PID 644 set thread context of 1700	644	vbc.exe	29
PID 644 set thread context of 1888	644	vbc.exe	32

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1348	8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
644	vbc.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1348 wrote to memory of 644	1348	8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe	28
PID 1348 wrote to memory of 644	1348	8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe	28
PID 1348 wrote to memory of 644	1348	8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe	28
PID 1348 wrote to memory of 644	1348	8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe	28
PID 1348 wrote to memory of 644	1348	8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe	28
PID 1348 wrote to memory of 644	1348	8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe	28
PID 1348 wrote to memory of 644	1348	8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe	28
PID 1348 wrote to memory of 644	1348	8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe	28
PID 644 wrote to memory of 1700	644	vbc.exe	29
PID 644 wrote to memory of 1700	644	vbc.exe	29
PID 644 wrote to memory of 1700	644	vbc.exe	29
PID 644 wrote to memory of 1700	644	vbc.exe	29
PID 644 wrote to memory of 1700	644	vbc.exe	29
PID 644 wrote to memory of 1700	644	vbc.exe	29
PID 644 wrote to memory of 1700	644	vbc.exe	29
PID 644 wrote to memory of 1700	644	vbc.exe	29
PID 644 wrote to memory of 1700	644	vbc.exe	29
PID 644 wrote to memory of 1888	644	vbc.exe	32
PID 644 wrote to memory of 1888	644	vbc.exe	32
PID 644 wrote to memory of 1888	644	vbc.exe	32
PID 644 wrote to memory of 1888	644	vbc.exe	32
PID 644 wrote to memory of 1888	644	vbc.exe	32
PID 644 wrote to memory of 1888	644	vbc.exe	32
PID 644 wrote to memory of 1888	644	vbc.exe	32
PID 644 wrote to memory of 1888	644	vbc.exe	32
PID 644 wrote to memory of 1888	644	vbc.exe	32

C:\Users\Admin\AppData\Local\Temp\8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe
"C:\Users\Admin\AppData\Local\Temp\8f6548a916deec038c9bf6b802145c097afc8e5035848bbd8153eedd0795cbd2.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1348
- 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:644
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\ovrf8znbF5.ini"
    3⤵
    PID:1700
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\HYSSWbEgT7.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1888

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\ovrf8znbF5.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/644-62-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/644-57-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/644-58-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/644-60-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/644-75-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/644-87-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/644-79-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1348-56-0x0000000074470000-0x0000000074A1B000-memory.dmp

Filesize
5.7MB

Download
memory/1348-67-0x0000000074470000-0x0000000074A1B000-memory.dmp

Filesize
5.7MB

Download
memory/1348-55-0x0000000074470000-0x0000000074A1B000-memory.dmp

Filesize
5.7MB

Download
memory/1348-54-0x0000000075F81000-0x0000000075F83000-memory.dmp

Filesize
8KB

Download
memory/1700-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1700-74-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1700-76-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1700-72-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1700-68-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1888-80-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1888-84-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1888-85-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1888-86-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

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